See E. I. Stewart, Washington: Northwest Frontier (4 vol., 1957); M. W. Avery, Washington: A History of the Evergreen State (1965); P. L. Beckett, From Wilderness to Enabling Act (1968); J. Olson and G. Olson, Washington Times and Trails (1970); J. A. Alwin, Between the Mountains: A Portrait of Eastern Washington (1984); C. J. Manson, Theses on Washington Geology, 1901–1985 (1986); J. W. Scott and R. L. DeLorme, Historical Atlas of Washington (1988).
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