(Composite map) Geologic map of North America. Compiled by the United States Geological Survey in cooperation with the Geological Survey of Canada and Instituto Geologico de Mexico ; under the supervision of Bailey Willis and George W. Stose. 1911. Geologic drafting by Henry S. Selden. Engraved and printed by the U.S. Geological Survey. (insets) Aleutian Islands. (with) Windward Islands. (at the margin) Professional paper 71. U.S. Geological Survey, George Otis Smith, Director.

Composite map of sheets 1A-D: U.S.G.S. Professional paper 71.