Map of the gold regions in the vicinity of Central City, Gilpin County, Colorado Territory / from actual survey by John J. Pratt and Bela S. Buell, civil engineers and surveyors.
MLA
Pratt, John J., b. 1833. Map of the gold regions in the vicinity of Central City, Gilpin County, Colorado Territory / from actual survey by John J. Pratt and Bela S. Buell, civil engineers and surveyors.. BRBL_00590. 1862. https://collections.library.yale.edu/catalog/15818456.
APA, 6th edition
Pratt, John J., b. 1833. (["BRBL_00590"])(1862)[Map of the gold regions in the vicinity of Central City, Gilpin County, Colorado Territory / from actual survey by John J. Pratt and Bela S. Buell, civil engineers and surveyors.]. https://collections.library.yale.edu/catalog/15818456.
