State of Colorado : compiled from the official records of the General Land Office and other sources / under the supervision of G.P. Strum, principal draughtsman G.L.O.
MLA
Office, United States. General Land. State of Colorado : Compiled from the Official Records of the General Land Office and Other Sources / under the Supervision of G.P. Strum, Principal Draughtsman G.L.O. Julius Bien & Co., 1885. https://collections.library.yale.edu/catalog/15818415.
APA, 6th edition
Office, U. S. G. L. (1885). State of Colorado : compiled from the official records of the General Land Office and other sources / under the supervision of G.P. Strum, principal draughtsman G.L.O. [Maps]. Julius Bien & Co., https://collections.library.yale.edu/catalog/15818415.