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 sheets 56 x 72 centimeters or smallerJPEGUMN_ALMA:9927561910001701engU.S. Geological Survey (Washington)PublicPlan and profile of Colorado River from Black Canyon, Arizona-Nevada to Arizona-Sonora boundaryMapsArizonaNevadaUniversity of Minnesota