Map of the Maine Central R.R. : the White Mountains & Mount Desert route / Rand Avery Supply Co., engr's.
MLA
Map of the Maine Central R.R. : the White Mountains & Mount Desert Route / Rand Avery Supply Co., Engr's. s.n., 1890. https://collections.library.yale.edu/catalog/15606961.
APA, 6th edition
Map of the Maine Central R.R. : the White Mountains & Mount Desert route / Rand Avery Supply Co., engr's. (1890). [Maps]. s.n., https://collections.library.yale.edu/catalog/15606961.