Map of Virginia, Gold Hill, Devils Gate, American Flat gold & silver mining districts : state of Nevada / Higginson & Goldsworthy, civil & mining engineers ; W. Vallance Gray, lith.
MLA
Higginson, and Goldsworthy. Map of Virginia, Gold Hill, Devils Gate, American Flat Gold & Silver Mining Districts : State of Nevada / Higginson & Goldsworthy, Civil & Mining Engineers ; W. Vallance Gray, Lith. A. Gensoul,, Pacific Map Depot : 0AD. https://collections.library.yale.edu/catalog/15818541.
APA, 6th edition
H., & G. (0 C.E.). Map of Virginia, Gold Hill, Devils Gate, American Flat gold & silver mining districts : state of Nevada / Higginson & Goldsworthy, civil & mining engineers ; W. Vallance Gray, lith. [Maps]. A. Gensoul,, Pacific Map Depot : https://collections.library.yale.edu/catalog/15818541.