Cite

State of Iowa / compiled from the official records of the General Land Office and other sources under supervision of G.P. Strum.

MLA

Office, United States. General Land. State of Iowa / Compiled from the Official Records of the General Land Office and Other Sources under Supervision of G.P. Strum. General Land Office ;, Photo lith & print. by Julius Bien & Co., 1885. https://collections.library.yale.edu/catalog/15814617.

APA, 6th edition

Office, U. S. G. L. (1885). State of Iowa / compiled from the official records of the General Land Office and other sources under supervision of G.P. Strum. [Maps]. General Land Office ;, Photo lith & print. by Julius Bien & Co., https://collections.library.yale.edu/catalog/15814617.