MLA

of Railroad Commissioners, Minnesota. Office. Railroad Commissioners' Map of Minnesota, 1930 / Prepared under the Direction of the Commission ; Compiled and Published by McGill-Warner Co. McGill-Warner Co., 0AD. https://collections.library.yale.edu/catalog/15814575.

APA, 6th edition

of Railroad Commissioners, M. O. (0 C.E.). Railroad commissioners' map of Minnesota, 1930 / prepared under the direction of the commission ; compiled and published by McGill-Warner Co. [Maps]. McGill-Warner Co., https://collections.library.yale.edu/catalog/15814575.