1949. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1938-1941. Topography by plane-table methods, 1947.";... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
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1949. Geological Survey (U.S.). Contour interval 20 feet.;"Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods, 1946-1947";... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1949. Geological Survey (U.S.). Contour interval 10 feet;"Culture and drainage in part compiled from aerial photographs taken 1938. Topography by plane-table methods 1947.";Relief... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1958. Geological Survey (U.S.). Contour interval 10 feet.;"Culture and drainage in part compiled from aerial photographs taken 1954. Topography by planetable surveys 1924, Revised... Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1949. Geological Survey (U.S.). Contour interval 10 feet.;"Topography by plane-table methods, 1946";Relief shown by contours and spot heights.;1 map, colored;45 x 34 cm.;1:62,500. Geological Survey (U.S.) and Geological Survey Division (Urbana, Ill.).
1924. Geological Survey (U.S.). Relief shown by contours and spot heights.; Index map on each sheet. each sheet 54 x 69 centimeters or smaller Scale 1:31,680 General Map Collection. The Survey (Washington, D.C).
1925. Geological Survey (U.S.). Relief shown by contours and spot heights ; contour interval on land 20 ft. ; contour interval on river surface 5 ft.; Survey dates: 1924.; Topogra... The Survey (Washington).
398. Plan and profile of Colorado River from Black Canyon, Arizona-Nevada to Arizona-Sonora boundary
1927. Geological Survey (U.S.). Relief shown by contours and spot heights.; Each sheet includes "Key map of plan sheets."; "Printed in 1927."; "19 plans, 1 profile sheet." on shee... U.S. Geological Survey (Washington).
1926. Geological Survey (U.S.). Relief shown by contours and spot heights ; contour interval on land 25 ft. contour interval on river surface 5 ft.; Survey dates between 1913 and ... The Survey (Washington).
1927. Geological Survey (U.S.). Relief shown by contours and spot heights.; "Surveyed in 1926."; Index map on each sheet. 46 x 63 centimeters + Scale 1:31,680 General Map Collection. The Survey.