
Alaska Volcano Observatory, National Oceanic and Atmospheric Administration, National Weather Service, Federal Aviation Administration, Department of Defense, United States Coast Guard, Division of Homeland Security and Emergency Management, Alaska Department of Environmental Conservation, and Alaska Department of Health and Social Services (participating agencies), 2022, Alaska interagency operating plan for volcanic ash episodes, 85 p.
old ash plan from 2004 : 1.72 MB
old ash plan from 2008 : 907 KB
old ash plan from 2011 : 4.7 MB
old ash plan from 2014 : 4.47 MB
old ash plan from 2017 : 2.7 MB
2022 version : 4 mb
Davies, L.J., Jensen, B.L., and Kaufman, D.S., 2022, Late Holocene cryptotephra and a provisional 15,000-year Bayesian age model for Cascade Lake, Alaska: Geochronology, v. 4, p. 121-141, doi:10.5194/gchron-4-121-2022.
publication on publishers websiteCameron, C.E., Crass, S.W., and AVO Staff, eds, 2022, Geologic database of information on volcanoes in Alaska (GeoDIVA): Alaska Division of Geologic and Geophysical Surveys Digital Data Series 20, https://doi.org/10.14509/geodiva, https://doi.org/10.14509/30901.
LinkJensen, B.J.L., Davies, L.J., Nolan, C., Pyne-O’Donnell, S., Monteath, A.J., Ponomareva, V., Portnyagin, M., Booth, R., Bursik, M., Cook, E., Plunkett, G., Vallance, J.W., Luo, Y., Cwynar, L.C., Hughes, P., and Pearson, D.G., 2021, A latest Pleistocene and Holocene composite tephrostratigraphic framework for northeastern North America: Quaternary Science Reviews, v. 272, article no. 107242, 31 p., https://doi.org/10.1016/j.quascirev.2021.107242
Bolton, M.S.M., Jensen, B.J.L., Wallace, Kristi, Praet, Nore, Fortin, David, Kaufman, Darrell, and De Batist, Marc, 2020, Machine learning classifiers for attributing tephra to source volcanoes: an evalution of methods for Alaska tephras: Journal of Quaternary Science, v. 35, n. 1-2, p. 81-92, doi:10.1002/jqs.3170.
Kristensen, T.J., Andrews, T.D., MacKay, Glen, Gotthardt, Ruth, Lynch, S.C., Duke, M.L.M., Locock, A.J., and Ives, J.W., 2019, Identifying and sourcing pyrometamorphic artifacts: Clinker in subarctic North America and the hunter-gatherer response to a Late Holocene volcanic eruption: Journal of Archaeological Science: Reports 23, p. 773-790.
Mulliken, K.M., Schaefer, J.R., and Cameron, C.E., 2018, Geospatial distribution of tephra fall in Alaska: a geodatabase compilation of published tephra fall occurrences from the Pleistocene to the present: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 164, 46 p. http://doi.org/10.14509/29847
Link to DGGS publication pageWorden, A.K., Schaefer, J.R., and Mulliken, K.M., 2018, Tephra occurrence in Alaska: a map-based compilation of stratigraphic tephra data: Alaska Division of Geological and Geophysical Surveys Miscellaneous Publication 165, 19 p., http://doi.org/10.14509/30059
publication for download on DGGS websiteEwert, J.W., Diefenbach, A.K., and Ramsey, D.W., 2018, 2018 update to the U.S. Geological Survey national volcanic threat assessment: U.S. Geological Survey Scientific Investigations Report 2018-5140, 40 p., https://doi.org/10.3133/ sir20185140.
download from USGSLynch, J.J., Goebel, Ted, Graf, K.E., Rasic, J.T., and S.C. Kuehn, 2018, Archaeology of the uppermost Tanana Basin: results of a survey of the Nabesna and Chisana Rivers, east-central Alaska: Alaska Journal of Anthropology, v. 16, no. 1, p. 21-43.
Watson, E.J., Kolaczek, P., Slowinski, M., Swindles, G.T., Marcisz, K., Galka, M. and Lamentowicz, M., 2017, First discovery of Holocene Alaskan and Icelandic tephra in Polish peatlands: Journal of Quaternary Science, v. 32, n. 4, p. 457-462.
Watson, E.J., Swindles, G.T., Lawson, I.T., Savov, I.P., and Wastegård, S., 2017, The presence of Holocene cryptotephra in Wales and southern England: Journal of Quaternary Science, v. 32, n. 4, p. 493-500.
Pearce, Christof, Varhelyi, Aron, Wastegard, Stefan, Muschitiello, Francesco, Barrientos, Natalia, O'Regan, Matt, Cronin, T.M., Gemery, Laura, Semiletov, Igor, Backman, Jan, and Jakobsson, Martin, 2017, The 3.6 ka Aniakchak tephra in the Arctic Ocean: a constraint on the Holocene radiocarbon reservoir age in the Chukchi Sea: Climate of the Past, v. 13, no. 4, p. 303-316.
Patterson, R.T., Crann, C.A., Cutts, J.A., Mustaphi, C.J.C., Nasser, N.A., Macumber, A.L., Galloway, J.M., Swindles, G.T., and Falck, Hendrik, 2017, New occurrences of the White River Ash (east lobe) in Subarctic Canada and utility for estimating freshwater reservoir effect in lake sediment archives: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 477, p. 1-9.
Monteath, A.J., van Hardenbroek, M., Davies, L.J., Froese, D.G., Langdon, P.G., Xu, X., and Edwards, M.E., 2017, Chronology and glass chemistry of tephra and cryptotephra horizons from lake sediments in northern Alaska, USA: Quaternary Research, v. 88, p. 1-10.

Mackay, Helen, Hughes, P.D.M., Jensen, B.J.L., Langdon, P.G., Pyne-O’Donnell, S.D.F., Plunkett, Gill, Froese, D.G., Coulter, Sarah, Gardner, J.E., 2016, A mid to late Holocene cryptotephra framework from eastern North America: Quaternary Science Reviews, v. 132, p. 101-113.

Davies, L. J., Jensen, B. J., Froese, D. G., and Wallace, K. L., 2016, Late Pleistocene and Holocene tephrostratigraphy of interior Alaska and Yukon: Key beds and chronologies over the past 30,000 years: Quaternary Science Reviews, v. 146, p. 28-53.
Cameron, C.E., and Snedigar, S.F., 2016, Alaska Volcano Observatory image database: Alaska Division of Geological & Geophysical Surveys Digital Data Series 13, https://www.avo.alaska.edu/images/. https://doi.org/10.14509/29689.
publication page at DGGS
AVO image databaseCameron, C.E., and Nye, C.J., 2014, Preliminary database of Quaternary vents in Alaska: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication 153, 11 p., doi:10.14509/27357 .

Preece, S.J., McGimsey, R.G., Westgate, J.A., Pearce, N.J.G., Hart, W.K., and Perkins, W.T., 2014, Chemical complexity and source of the White River Ash, Alaska and Yukon: Geosphere, v. 10, n.5., p. 1020-1042, doi: 10.1130/GES00953.1

Jensen, B.J.L., Pyne-O'Donnell, Sean, Plunkett, Gill, Froese, D.G., Hughes, P.D.M., Sigl, Michael, McConnell, J.R., Amesbury, M.J., Blackwell, P.J., van den Bogaard, Christel, Buck, C.E., Charman, D.J., Clague, J.J., Hall, V.A., Koch, Johannes, Mackay, Helen, Mallon, Gunnar, McColl, Lynsey, and Pilcher, J.R., 2014, Transatlantic distribution of the Alaskan White River Ash: Geology, v. 42, n. 10, p. 875-878, doi:10.1130/G35945.1

Zander, P.D., Kaufman, D.S., Kuehn, S.C., Wallace, K.L., and Anderson, R.S., 2013, Early and late Holocene glacial fluctuations and tephrostratigraphy, Cabin Lake, Alaska: Journal of Quaternary Science, v. 28, n. 8, p. 761-771, doi:10.1002/jqs.2671 .

Pyne-O'Donnell, S.D.F., Hughes, P.D.M., Froese, D.G., Jensen, B.L., Kuehn, S.C., Mallon, Gunnar, Amesbury, M.J., Charman, D.J., Daley, T.J., Loader, N.J., Mauquoy, Dmitri, Street-Perrott, F.A., and Woodman-Ralph, Jonathan, 2012, High-precision ultra-distal Holocene tephrochronology in North America: Quaternary Science Reviews, v. 52, p. 6-11, doi: 10.1016/j.quasicrev.2012.07.024

Coulter, S.E., Pilcher, J.R., Plunkett, Gill, Baillie, Mike, Hall, V.A., Steffensen, J.P., Vinther, B.M., Clausen, H.B., and Johnsen, S.J., 2012, Holocene tephras highlight complexity of volcanic signals in Greenland ice cores: Journal of Geophysical Research, v. 117, 11 p., doi:10.1029/2012JD017698, 2012

Mullen, P.O., 2012, An archaeological test of the effects of the White River Ash eruptions: Arctic Anthropology, v. 49, p. 35-44.

Finzel, E.S., Trop, J.M., Ridgway, K.D., and Enkelmann, Eva, 2011, Upper plate proxies for flat-slab subduction processes in southern Alaska: Earth and Planetary Science Letters, v. 303, n. 3-4, p. 348-360, doi:10.1016/j.epsl.2011.01.014 .

Dunning, H., 2011, Extending the Applications of Tephrochronology in Northwestern North America: University of Alberta M.S. Thesis, 187 p.
Mastin, L.G., Guffanti, Marianne, Ewert, J.E., and Spiegel, Jessica, 2009, Preliminary spreadsheet of eruption source parameters for volcanoes of the world: U.S. Geological Survey Open-File Report 2009-1133, v. 1.2, 25 p., available at http://pubs.usgs.gov/of/2009/1133/ .
USGS website with links to PDF and spreadsheetsUrmann, David, 2009, Decadal scale climate variability during the last millenium as recorded by the Bona Churchill and Quelccaya ice cores: Ohio State University Ph.D. dissertation, 281 p.

Westgate, J.A., Preece, S.J., Froese, D.G., Pearce, N.J.G., Roberts, R.G., Demuro, M., Hart, W.K., and Perkins, W., 2008, Changing ideas on the identity and stratigraphic significance of the Sheep Creek tephra beds in Alaska and the Yukon Territory, northwestern North America: Quaternary International, v. 178, n. 1, p. 183-209, doi: 10.1016/j.quaint.2007.03.009.

Lerbekmo, J.F., 2008, The White River ash: largest Holocene plinian tephra: Canadian Journal of Earth Sciences, v. 45, n. 6, p. 693-700.

Payne, Richard, Blackford, Jeffrey, and van der Plicht, Johannes, 2008, Using cryptotephras to extend regional tephrochronologies: an example from southeast Alaska and implications for hazard assessment: Quaternary Research, v. 69, n. 1, p. 42-55.

Payne, Richard, and Blackford, Jeffrey, 2008, Distal volcanic impacts on peatlands: palaeoecological evidence from Alaska: Quaternary Science Reviews, v. 27, n. 21-22, p. 2012-2030, doi: 10.1016/j.quascirev.2008.08.002 .

Ewert, John, 2007, System for ranking relative threats of U.S. volcanoes: Natural Hazards Review, v. 8, n. 4, p. 112-124.
West, K.D., 2007, Resedimentation of the late Holocene White River ash, Yukon Territory, Canada, and Alaska, USA: Carleton University Ph.D. dissertation, 269 p.
Dixon, J.P., Stihler, S.D., Power, J.A., Tytgat, Guy, Estes, Steve, and McNutt, S.R., 2006, Catalog of earthquake hypocenters at Alaskan volcanoes: January 1 through December 31, 2005: U.S. Geological Survey Open-File Report 2006-1264, 78 p., available at http://pubs.usgs.gov/of/2006/1264/ .
website with links to doc in PDF and data package
Ewert, John, Guffanti, Marianne, Cervelli, Peter, and Quick, James, 2006, The National Volcano Early Warning System (NVEWS): U.S. Geological Survey Fact Sheet FS 2006-3142, 2 p., available at http://pubs.usgs.gov/fs/2006/3142 .
PDF on USGS server : 1 MB
Richter, D.H., Preller, C.C., Labay, K.A., and Shew, N.B., compilers, 2006, Geologic map of the Wrangell-Saint Elias National Park and Preserve, Alaska: U.S. Geological Survey Scientific Investigations Map 2877, 15 p., 1 plate, scale 1:350,000, available at http://pubs.usgs.gov/sim/2006/2877/ .
USGS website with links to PDFs of the publicationJensen, B.J., Froese, D.G., Preece, S.J., and Westgate, J.A., 2006, An extensive middle to late Pleistocene distal tephra record from East Central Alaska [abs.]: Eos, Joint Assembly Supplement, v. 87, abstract V33B-0662.

Ewert, J.W., Guffanti, Marianne, and Murray, T.L., 2005, An assessment of volcanic threat and monitoring capabilities in the United States: framework for a National Volcano Early Warning System NVEWS: U.S. Geological Survey Open-File Report 2005-1164, 62 p.
full-text PDF : 2.90 MB
Alaska Volcano Observatory, 2004, May-June 2002: Alaska Volcano Observatory Bimonthly Report, v. 14, n. 3, unpaged.
websiteSiebert, L., and Simkin, T., 2002-, Volcanoes of the world: an illustrated catalog of Holocene volcanoes and their eruptions: Smithsonian Institution, Global Volcanism Program Digital Information Series GVP-3, http://volcano.si.edu/search_volcano.cfm, unpaged internet resource.
websiteCameron, C. E., Triplehorn, J. H., and Robar, C. L., 2003, Bibliography of information on Alaska volcanoes: Alaska Division of Geological & Geophysical Surveys Miscellaneous Publication MP 131, 1 CD-ROM.

Stasiuk, M.V., Hickson, C.J., and Mulder, Taimi, 2003, The vulnerability of Canada to volcanic hazards: Natural Hazards, v. 28, p. 563-589.

van den Bogaard, C., and Schmincke, H.U., 2002, Linking the North Atlantic to central Europe: A high-resolution Holocene tephrochronological record from northern Germany: Journal of Quaternary Science, v. 17, p. 3-20, doi: 10.1002/jqs.636

Robinson, S.D., 2001, Extending the Late Holocene White River Ash distribution, northwestern Canada: Arctic, v. 54, n. 2, p. 157-161.
link to PDF on U. Calgary website
Winkler, G. R., MacKevett, E. M. Jr., Plafker, George, Richter, D. H., Rosenkrans, D. S., and Schmoll, H. R., 2000, A geologic guide to Wrangell-Saint Elias National Park and Preserve, Alaska: A tectonic collage of northbound terranes: U.S. Geological Survey Professional Paper PP 1616, 166 p.
full-text PDF : 48.5 MB

Nye, C. J., Queen, Katherine, and McCarthy, A. M., 1998, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000, available at http://www.dggs.dnr.state.ak.us/pubs/pubs?reqtype=citation&ID=7043 .
website with links to sheets in PDF formatWilson, M. D., 1997, Wrangell-St. Elias National Park and Preserve: in Harris, A. G., Tuttle, E., and Tuttle, S., (eds.), Geology of national parks, Dubuque, IA, Kendall/Hunt Publishing Company, p. 392-406.

Donaldson, J. A., Guerstein, P. G., and Mueller, Wulf, 1996, Facies analysis of a pumiceous terrace beside Klutlan Glacier, Yukon Territory: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 33, n. 9, p. 1233-1242.
Preece, S. J., Hart, W. K., and Westgate, J. A., 1996, Silicic materials in the Wrangell volcanic field, Alaska and their significance for the origin of distal type II tephra beds in interior Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 28, n. 7, p. 504.

Pilcher, J.R., Hall, V.A., and McCormac, F.G., 1996, An outline tephrochronology for the Holocene of the north of Ireland: Journal of Quaternary Science, v.11, p. 485-494, doi:10.1002/(SICI)1099-1417(199611/12)11:6<485::AID-JQS266>3.0.CO;2-T

Richter, D. H., Preece, S. J., McGimsey, R. G., and Westgate, J. A., 1995, Mount Churchill, Alaska: source of the late Holocene White River Ash: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 32, n. 6, p. 741-748.
McGimsey, R. G., Richter, D. H., Waythomas, C. F., and Donaldson, J. A., 1995, Potential hazards from future eruptions of Mt. Churchill, Alaska [abs.]: Abstracts with Programs - Geological Society of America, v. 27, n. 5, p. 63.

Clague, J. J., Evans, S. G., Rampton, V. N., and Woodsworth, G. J., 1995, Improved age estimates for the White River and Bridge River tephras, western Canada: Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 32, p. 1172-1179.
Zielinski, R. A., 1995, Stratospheric loading and optical depth estimates of explosive volcanism over the last 2100 years derived from the Greenland Ice Sheet Project 2 ice core: Journal of Geophysical Research, v. 100, n. D10, p. 20,937-20,955.
Alaska Division of Geological & Geophysical Surveys, 1995, Volcanoes of Alaska: Alaska Division of Geological & Geophysical Surveys Information Circular IC 0038, unpaged, 1 sheet, scale 1:4,000,000.

Pilcher, J.R., Hall, V.A., and McCormac, F.G., 1995, Dates of Holocene Icelandic volcanic eruptions from tephra layers in Irish peats: The Holocene, v.5, p. 103-110, doi:10.1177/095968369500500111.
Donaldson, J. A., and Mueller, Wulf, 1994, Dispersal of pumice along Klutlan Glacier, Yukon Territory [abs.]: Abstracts with Programs - Geological Society of America, v. 26, n. 7, p. 113.
Miller, T. P., and Richter, D. H., 1994, Quaternary volcanism in the Alaska Peninsula and Wrangell Mountains, Alaska: in Plafker, George, Jones, D. L., and Berg, H. C., (eds.), The Geology of Alaska, Geological Society of America The Geology of North America series v. G-1, p. 759-779.
Hickson, C. J., 1994, Volcanism in the Canadian Cordillera: Canada's hazard response preparedness: in Casadevall, T. J., (ed.), Volcanic ash and aviation safety: Proceedings of the first international symposium on volcanic ash and aviation safety, U.S. Geological Survey Bulletin 2047, p. 47-55.
Simkin, Tom, and Siebert, Lee, 1994, Volcanoes of the world [2nd edition]: Tucson, Arizona, Geoscience Press, 349 p.
Emanuel, R. P., 1992, Seeking the source: Alaska, v. 58, n. 9, p. 36-39.

McGimsey, R.G., Richter, D.H., DuBois, G.D., and Miller, T.P., 1992, A postulated new source for the White River Ash, Alaska, in Bradley, D.C. and Ford, A.B., eds., Geologic Studies in Alaska by the U.S. Geological Survey, 1990: U.S. Geological Survey Bulletin 1992, p. 212-218.
fulll-text PDF : 618 KB

Moodie, D. W., Catchpole, A. J. W., and Abel, Kerry, 1992, Northern Athapaskan oral traditions and the White River volcano: Ethnohistory, v. 39, n. 2, p. 148-171.

Preece, S. J., Westgate, J. A., and Gorton, M. P., 1992, Compositional variation and provenance of late Cenozoic distal tephra beds, Fairbanks area, Alaska: Quaternary International, v. 13/14, p. 97-101.

Edwards, D., 1991, Tephrochronology in the Kluane region of the Yukon Territory, Canada: The Edinburgh Geologist, v. 25, p. 15-24.
Souther, J. G., 1991, Volcanic regimes: in Gabrielse, H. and Yorath, C. J., (eds.), Geology of the Cordilleran Orogen of Canada (DNAG), Boulder, CO, Geological Society of America, p. 459-490.

Wilbur, S. C., Molinari, M. P., Beget, J. E., and Hengesh, J. V., 1991, Four Holocene tephra from the Prince William Sound area, Alaska [abs.]: Geological Society of America - Abstracts with Programs, v. 23, n. 5, p. 398.
Hickson, C. J., 1990, Can it happen here? A major volcanic eruption could occur in the Canadian Cordillera: it might significantly affect our environment: Geos, v. 19, p. 1-7.

Richter, D. H., Smith, J. G., Lanphere, M. A., Dalrymple, G. B., Reed, B. L., and Shew, N., 1990, Age and progression of volcanism, Wrangell volcanic field, Alaska: Bulletin of Volcanology, v. 53, n. 1, p. 29-44.
Jacob, K. H., 1986, Seismicity, tectonics, and geohazards of the Gulf of Alaska: in Hood, D. W. and Zimmerman, S. T., (eds.), The Gulf of Alaska: physical environment and biological recourses, Washington, DC, U.S. Department of Commerce & U.S. Department of the Interior, p. 145-184.
Luedke, R. G., and Smith, R. L., 1986, Map showing distribution, composition, and age of Late Cenozoic volcanic centers in Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1091-F, unpaged, 3 sheets, scale 1:1,000,000.
ADGGS website with links to map PDFs
Downes, Hilary, 1985, Evidence for magma heterogeneity in the White River Ash (Yukon Territory): Canadian Journal of Earth Sciences [Journal Canadien des Sciences de la Terre], v. 22, n. 6, p. 929-934.

Crampton, C. B., 1982, Volcanic ash soils in the southern Yukon of Canada: The Musk-Ox, v. 30, p. 81-84.

Westgate, J. A., and Gorton, M. P., 1981, Correlation techniques in tephra studies: in Self, S. and Sparks, R. S. J., Tephra studies: proceedings of the NATO Advanced Study Institute "Tephra studies as a tool in Quaternary research", NATO Advanced Study Institutes Series C 0075, p. 73-94.

Porter, S. C., 1981, Use of tephrochronology in the Quaternary geology of the United States: in Self, S. and Sparks, R. S. J., Tephra studies: proceedings of the NATO Advanced Study Institute "Tephra studies as a tool in Quaternary research", NATO Scientific Affairs Division NATO advanced study institutes series C 0075, p. 135-160.
Williams, J. R., and Johnson, K. M., 1980, Map and description of late Tertiary and Quaternary deposits, Valdez quadrangle, Alaska: U.S. Geological Survey Open-File Report 80-0892C, unpaged, 2 plates, scale 1:250,000.

Workman, W. B., 1979, The significance of volcanism in the prehistory of subarctic Northwest North America, in Sheets, P. D. and Grayson, D. K. (eds.), Volcanic activity and human ecology, New York, NY, Academic Press, p. 339-367.
MacKevett, E. M. Jr., 1978, Geologic map of the McCarthy quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I 1032, unpaged, 1 plate, scale 1:250,000.

Lerbekmo, J. F., Westgate, J. A., Smith, D. G. W., and Denton, G. H., 1975, New data on the character and history of the White River volcanic eruption, Alaska: in Quaternary studies: selected papers from IX INQUA congress, Royal Society of New Zealand Bulletin 0013, p. 203-209.

Pewe, T. L., 1975, Quaternary stratigraphic nomenclature in unglaciated central Alaska: U.S. Geological Survey Professional Paper PP 0862, 32 p.
full-text PDF : 2.1 MB
Lowdon, J.A., and Blake, Jr., W., 1968, Geological Survey of Canada radiocarbon dates IX: Radiocarbon, v. 12, p. 46-86.
Lowdon, J.A., Wilmeth, R., and Blake, Jr., W., 1970, Geological Survey of Canada radiocarbon dates X: Radiocarbon, v. 12, p. 472-485.
Lowdon, J.A., and Blake, Jr., W., 1968, Geological Survey of Canada radiocarbon dates VII: Radiocarbon, v. 10, p. 207-245.

Hanson, L. W., 1965, Size distribution of the White River Ash, Yukon Territory: University of Alberta M.S. thesis, 59 p.

Rossman, D. L., 1959, Geology and ore deposits of northwestern Chichagof Island, Alaska: U.S. Geological Survey Bulletin 1058-E, p. 139-216, 2 sheets, scale 1:63,360.
full-text PDF : 1.6 MB
plate 12 PDF : 46 MB
plate 13 PDF : 232 KB

MacIntosh, G.D., no date, The Calendric Dating and Seasonality of the White River Ash: unpublished data University of Alaska Fairbanks.
West, K.D., and Donaldson, J. Allan, no date, Evidence for winter eruption of the White River Ash (eastern lobe), Yukon Territory, Canada: report, 4 p.