You are viewing a map of Oregon and upper California from the surveys of John Charles Fremont and other authorities / drawn by Charles Preuss under the order of the Senate of the United States ; lithy. by E. Weber & Co., Balto. It was made in 1848.
Shows area of U.S. west of the Continental Divide."Profile of the travelling route from the South Pass of the Rocky Mountains to the Bay of San Francisco.".
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