Cite

State of Colorado : compiled from the official records of the General land office and other sources / compiled by A.F. Dinsmore ; traced and lettered by Wm. Bauman Jr., U.S. General Land Office.

MLA

Office, United States. General Land. State of Colorado : Compiled from the Official Records of the General Land Office and Other Sources / Compiled by A.F. Dinsmore ; Traced and Lettered by Wm. Bauman Jr., U.S. General Land Office. Supt. of Docs., G.P.O., 1910. https://collections.library.yale.edu/catalog/15818424.

APA, 6th edition

Office, U. S. G. L. (1910). State of Colorado : compiled from the official records of the General land office and other sources / compiled by A.F. Dinsmore ; traced and lettered by Wm. Bauman Jr., U.S. General Land Office. [Maps]. Supt. of Docs., G.P.O., https://collections.library.yale.edu/catalog/15818424.