Topographical Map of Colorado River Valley1921-01-01unknownhttp://rightsstatements.org/vocab/NKC/1.0/enghttp://congressarchives.org/record/CAC_CC_053_4_0000_1_7This Topographical Map, produced by the Department of the Interior, includes handwritten annotations of fault lines, canals, and tunnels, and was surveyed in 1902-1903 and 1909. Dimensions: 16 1/2 x 20.