Tham khảo Xứ Oregon

Tham khảo Xứ Oregon

↑ Clarke, S.A. (1905). Pioneer Days of Oregon History. J.K. Gill Company.
↑ Meinig, D.W. (1968, pg.52) The Great Columbia Plain: A Historical Geography, 1805-1910, University of Washington Press, Seattle, ISBN 0-295-97485-0

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