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  • Color image map : [ports of entry, United States-Mexican border] /

    Relief shown by spot heights. "Photoimagery rectified by optical scanning from color infrared aerial photograph taken ... by the Dirección General de Geografía del Territorio National (DGGTN), Mexico D.F., Mexico." "For sale ...

    • Contributor: Geological Survey (U.S.)
    • Original Format: Maps
    • Date: 1979