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- U.S. Geological Survey139
- The Survey108
- Surveys and Mapping Division, Ministry of Lands, Housing and Urban Development91
- United States, Dept. of the Interior, Geological Survey51
- Geological Survey of Alabama29
- Directorate of Overseas Surveys for the United Republic of Tanzania13
- Central Intelligence Agency10
- Dept. of the Interior, U.S. Geological Survey9
- Geological Survey8
- Bureau of the Statistics and Census7
- Geological Survey of Canada6
- Research Council of Alberta5
- Survey Division Ministry of Lands, Settlement and Water Development5
- Defense Mapping Agency Topographic Center,Hubbard Scientific inc3
- Interior-Geological Survey2
- North Carolina Dept. of Natural and Economic Resources, Office of Earth Resources2
- United States Geological Survey2
- Bureau of the Statistics and Census, Geography Division1
- Defense Mapping Agency Topographic Center1
- Delaware Geological Survey, University of Delaware, Williams & Heintz Map Corp.)1
