Cite

Map of the railroads of the State of New York / prepared under the direction of Horatio Seymour Jr., State Engr. & Surveyor, Edward D. Smalley, Deputy State Engr. & Survr.

MLA

Weed, Parsons, and Co. Map of the Railroads of the State of New York / Prepared under the Direction of Horatio Seymour Jr., State Engr. & Surveyor, Edward D. Smalley, Deputy State Engr. & Survr. Lith. by Weed, Parsons & Co., 1880. https://collections.library.yale.edu/catalog/15790084.

APA, 6th edition

Weed, P., & C. (1880). Map of the railroads of the State of New York / prepared under the direction of Horatio Seymour Jr., State Engr. & Surveyor, Edward D. Smalley, Deputy State Engr. & Survr. [Maps]. Lith. by Weed, Parsons & Co., https://collections.library.yale.edu/catalog/15790084.