Color image map : [ports of entry, United States-Mexican border] /
Geological Survey (U.S.)
U.S. Customs Service.
Mexico.Dirección General Geografía de Territorio National.
Reston, Va. : The Survey,
1979-
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."
Each sheet separately titled and numbered.
Includes location map and diagram of "Adjoining color image map."
Ports of entry
Ports of entry
United States.
Mexico.