Cite

[Gill] Peter Parker to Theodore Gill, Washington, D.C.

MLA

Parker, Peter, 1804-1888. [Gill] Peter Parker to Theodore Gill, Washington, D.C.. 1874 February 14. https://collections.library.yale.edu/catalog/16808626.

APA, 6th edition

Parker, Peter, 1804-1888. (1874 February 14)[[Gill] Peter Parker to Theodore Gill, Washington, D.C.]. https://collections.library.yale.edu/catalog/16808626.