Schiff, C J; Kaufman, D S; Wallace, K L; Werner, A; Ku, T L & Brown, T A. Modeled tephra ages from lake sediments, base of Redoubt Volcano, Alaska, article, February 25, 2007; (https://digital.library.unt.edu/ark:/67531/metadc895033/m1/1/: accessed November 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .