Untitled - The National Map

Dirección General de Geografia del Territorio Nacional DIGETENAL. U.S. portion compiled by photogrammetric methods from aerial photographs taken 1972. Field checked 1974. Map edited 1980. Mexico portion copied from DIGETENAL 1:50 000-scale maps, Las Conchas H13D11 and Vado De Piedro H13d12, dated ...
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