Copyright, 1917, by Poole Bros. Chicago. Coordinates approximate and based on Greenwich meridian. Relief shown by spot heights. Informational text ... [Poole Bros.?],.
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Walcott, Charles D. (Charles Doolittle), 1850-1927. Department of the Interior U.S. Geological Survey Charles D. Walcott, Director. Map covers parts of the Yukon Territory and northern British Columb... U.S. Geological Survey,.