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
- Held by
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