Data users guide: National mapping program, technical instructions. Reston, Virginia: U.S. Geological Survey, Department of Interior.
Styl ChicagoData Users Guide: National Mapping Program, Technical Instructions. Reston, Virginia: U.S. Geological Survey, Department of Interior.
Citace podle MLAData Users Guide: National Mapping Program, Technical Instructions. Reston, Virginia: U.S. Geological Survey, Department of Interior.
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