Creator
- Geological Survey (U.S.)3
- Rumsey, David, 1944-3
- Canada Centre for Mapping2
- Instituto Nacional de Estadística, Geografía e Informática (Mexico)2
- National Atlas of the United States2
- Center for Spatial and Textual Analysis1
- EROS Data Center1
- Humboldt, Alexander von, 1769-18591
- International Boundary Commission1
- Ptolemy, Claudius1
- Ruscelli, Girolamo1
- USGS National Center for EROS1