Oregon Territory is shown extending north to 54°40'. Submap: Columbia River reduced from a survey made by the U.S. Ex. Ex. 1841.. Prime meridian: GM. Relief: hachures. Graphic Scale: Miles. Projection: Polyconic. Printing Process: Lithography. Other Features: Sub-maps. Verso Text: MS notes: E. L. Dup. M. E. .
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