See C. C. Hulley, Alaska, Past and Present (3d ed. 1970); B. Keating, Alaska (2d ed. 1971); H. W. Clark, History of Alaska (1930, repr. 1972); B. Cooper, Alaska, the Last Frontier (1973); Federal Writers' Project, A Guide to Alaska, Last American Frontier (1940, repr. 1973); L. Thomas Jr., Alaska and the Yukon (1983); R. W. Pearson and D. F. Lynch, Alaska: A Geography ; J. Strohmeyer, Extreme Conditions: Big Oil and the Transformation of Alaska (1993).