Robbins, W. G. (1997). Landscapes of promise: The Oregon story, 1800-1940. University of Washington Press.
Lua i Stíl Chicago (17ú heag.)Robbins, William G. Landscapes of Promise: The Oregon Story, 1800-1940. Seattle: University of Washington Press, 1997.
Lua MLA (9ú heag.)Robbins, William G. Landscapes of Promise: The Oregon Story, 1800-1940. University of Washington Press, 1997.
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