MLA

Gunn, O. B. (Otis Berthoude), 1828-1901. Gunn & Mitchell's new map of Kansas and the gold mines : embracing all the public surveys up to 1866, principal meridian / compiled from the original field notes by O.B. Gunn & D.T. Mitchell.. BRBL_00573. 1866. https://collections.library.yale.edu/catalog/15814817.

APA, 6th edition

Gunn, O. B. (Otis Berthoude), 1828-1901. (["BRBL_00573"])(1866)[Gunn & Mitchell's new map of Kansas and the gold mines : embracing all the public surveys up to 1866, principal meridian / compiled from the original field notes by O.B. Gunn & D.T. Mitchell.]. https://collections.library.yale.edu/catalog/15814817.