MLA

Roberts, Solomon W. (Solomon White), 1811-1882. Map of the Ohio and Pennsylvania Railroad : and connecting lines / Solomon W. Robert, Chief Engineer.. BRBL_00411. 1850. https://collections.library.yale.edu/catalog/15603734.

APA, 6th edition

Roberts, Solomon W. (Solomon White), 1811-1882. (["BRBL_00411"])(1850)[Map of the Ohio and Pennsylvania Railroad : and connecting lines / Solomon W. Robert, Chief Engineer.]. https://collections.library.yale.edu/catalog/15603734.