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por Whitehead, R. L.
Publicado 1994 -
Army engineers and the development of Oregona history of the Portland District US Army Corps of EngineersGovernment Document Bookpor Willingham, William F.
Publicado 1983 -
1100 000-scale metric topographic map of Grangeville Idaho--Oregon--Washingtoncartographic materialPublicado 1980