Swanson, S. E., Beget, J. E., and McGimsey, R. G., 1991, Compositional equivalence of tephra and lava groundmass glasses in the 1989-90 eruption of Mount Redoubt, Alaska: implication for eruption monitoring [abs.]: Abstracts with Programs - Geological Society of America, v. 23, n. 5, p. A396.