Cite

Map of portions of New York and New England showing the routes of the Dutchess and Columbia & Connecticut Western Rail Roads / Oliver W. Barnes.

MLA

Barnes, Oliver W. Map of Portions of New York and New England Showing the Routes of the Dutchess and Columbia & Connecticut Western Rail Roads / Oliver W. Barnes. H.H. Lloyd & Co.'s Map Establishment, 1868. https://collections.library.yale.edu/catalog/15753340.

APA, 6th edition

Barnes, O. W. (1868). Map of portions of New York and New England showing the routes of the Dutchess and Columbia & Connecticut Western Rail Roads / Oliver W. Barnes. [Maps]. H.H. Lloyd & Co.'s Map Establishment, https://collections.library.yale.edu/catalog/15753340.