Cite

[Country south of juncture of Appomatox and James Rivers] / Engineer Dept. H.Q. Army of the Potomac.

MLA

[Country South of Juncture of Appomatox and James Rivers] / Engineer Dept. H.Q. Army of the Potomac. 1863. https://collections.library.yale.edu/catalog/15811265.

APA, 6th edition

[Country south of juncture of Appomatox and James Rivers] / Engineer Dept. H.Q. Army of the Potomac. (1863). [Maps]. https://collections.library.yale.edu/catalog/15811265.