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1945. VMap1 is a vector digital topographic reference product developed by Natural Resources Canada (NRCan) and The Department of National Defence (DND).... Canada Centre for Mapping and Earth Observation.
1991. Powell, Susan and Navarro, Fernando. This point dataset represents the locations of springs identified as state protected nature zones ("Staatlich Geschütztes Natur-Objekt") in Mongoli... UC Berkeley Library.
1942. Powell, Susan and Navarro, Fernando. This point dataset represents point water sources, including wells and springs, in Mongolia in 1942, within the area referred to in the source map ... UC Berkeley Library.