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- United States. Central Intelligence Agency2
- United States. Office of Strategic Services. Research and Analysis Branch2
- Barberena, Santiago Ignacio, 1851-1916, cartographer1
- Deutsche Geologische Mission in El Salvador1
- Instituto Geográfico Nacional (El Salvador)1
- Instituto Geográfico Nacional Ingeniero Pablo Arnoldo Guzmán.1
- National Geographic Society (U.S.). Cartographic Division1
- Poole Brothers1
- Sonnenstern, Maximilian von, cartographer1
- United States. Defense Mapping Agency. Hydrographic/Topographic Center1
