Cite

Railroad map of Illinois [cartographic material] / prepared under the direction of the Board of Railroad and Warehouse Commissioners.

MLA

McNally, Rand, and Company. Railroad Map of Illinois [Cartographic Material] / Prepared under the Direction of the Board of Railroad and Warehouse Commissioners. Rand, McNally & Co., 0AD. https://collections.library.yale.edu/catalog/15814404.

APA, 6th edition

McNally, R., & C. (0 C.E.). Railroad map of Illinois [cartographic material] / prepared under the direction of the Board of Railroad and Warehouse Commissioners. [Maps]. Rand, McNally & Co., https://collections.library.yale.edu/catalog/15814404.