Cite

Massachusetts atlas plate no. 27.

MLA

Walker, Geo. H., and Co. Massachusetts Atlas Plate No. 27. Geo. H. Walker & Co., 0AD. https://collections.library.yale.edu/catalog/15639980.

APA, 6th edition

Walker, G. H., & C. (0 C.E.). Massachusetts atlas plate no. 27. [Maps]. Geo. H. Walker & Co., https://collections.library.yale.edu/catalog/15639980.