Relief shown by spot heights and landforms. ""Photoimagery rectified by optical scanning from color infrared aerial photograph taken June 22, 1982, by the Dirección General de Geografía del Territorio National (DGGTN), Mexico D.F., Mexico."" ""For sale by U.S. Geological Survey, Denver, Colorado 80225, or Reston, Virginia 22092 and byCentro de Asesoría y Venta de Información Estadística y Cartográfica, Balderas #71, Mezzanine, Mexico 1, D.F."" ""Projection and 1000-meter grid: Universal Transverse Mercator, zone 13. 10,000-foot grid ticks: Texas Coordinate System, central zone. 1927 North American Datum. To place on the predicted North American Datum 1983 move the projection ticks 8 meters south and 51 meters east."" Includes location map and diagram of ""Adjoining color image maps."" ""31106-F3-PI-025""--Lower right margin.