1866. American Central Railway Company. Relief shown using hachures.;1 map, colored;40 x 115 cm.;ca. 1:1,200,000. J. Bien (New York).
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2. State of Colorado : compiled from the official records of the General Land Office and other sources
1879. Roeser, C. (Charles). Relief shown by hachures.; "Department of the Interior, General Land Office, J.S. Williamson, Commissioner."; "Photo lith and print by Julius Bien,... J. Bien (New York).