Roe, J. (1992). The columbia river: A historical tranel guide. Colorado: Fulcrum Publishing.
Παραπομπή Chicago StyleRoe, Joann. The Columbia River: A Historical Tranel Guide. Colorado: Fulcrum Publishing, 1992.
Deismireacht MLARoe, Joann. The Columbia River: A Historical Tranel Guide. Colorado: Fulcrum Publishing, 1992.
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