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,.
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United States, Office of Strategic Services., Research and Analysis Branch. from OSS map no. 2200, March 1943. OSS.
Supreme Commander for the Allied Powers, Natural Resources Section. Natural Resources Section GHQ SCAP ; Source: Survey of coal reserves 1929-1931, excluding low-grade lignite, published 23 March 1932 by the Ministr... Natural Resources Section GHQ SCAP.