MLA

Map of the Catskill Mountains Prepared Expressly for the New York, West Shore & Buffalo RR Co 1884. W. Shore & Buffalo R.R., 1884. https://collections.library.yale.edu/catalog/15753375.

APA, 6th edition

Map of the Catskill mountains prepared expressly for the New York, West Shore & Buffalo RR Co 1884. (1884). [Maps]. W. Shore & Buffalo R.R., https://collections.library.yale.edu/catalog/15753375.