160 Years of Walrus Haulout Observations in Russia and Alaska

Fischbach, A.S., Kochnev, A.A., Garlich-Miller, J.L., and Jay, C.V., 2016, Pacific walrus coastal haulout database, 1852-2016-Background report: U.S. Geological Survey Open-File Report 2016–1108, 27 p. doi:10.3133/ofr20161108.