EarthWorks Geospatial Catalog

Standard time zones of the United States and adjacent parts of Canada and Mexico as of October 1, 1935 [cartographic material] / boundaries drawn by R.E. Gould, National Bureau of Standards and checked by the Interstate Commerce Commission.

"Base map by U.S. Geological Survey." "Information by Interstate Commerce Commission. Information by Interstate Commerce Commission, Hydrographic Office of the Navy Department, and Dominion Observatory of Canada."
National Bureau of Standards
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