Schaefer, J.R., and Wallace, K.L., 2012, Ash fall contour map of the 2009 eruption of Redoubt Volcano, Alaska: Digital shapefiles of contours and sample locations: Alaska Division of Geological and Geophysical Surveys Miscellaneous Publication 143, 1 DVD. Available free online at http://www.dggs.alaska.gov/pubs/id/23463 .
link to free download of publication on DGGS website