Citations are generated automatically from bibliographic data as
a convenience, and may not be complete or accurate.
Chicago citation style:
Geological Survey, U.S, Nelson Horatio Darton, George Huntington Williams, Arthur Keith, Herbert M Wilson, and U.S. Coast And Geodetic Survey. Economic geology sheet, Maryland--District of Columbia--Virginia, Washington quadrangle. [Washington?: U.S. Geological Survey, 1899] Map. https://www.loc.gov/item/87693491/.
APA citation style:
Geological Survey, U. S., Darton, N. H., Williams, G. H., Keith, A., Wilson, H. M. & U.S. Coast And Geodetic Survey. (1899) Economic geology sheet, Maryland--District of Columbia--Virginia, Washington quadrangle. [Washington?: U.S. Geological Survey] [Map] Retrieved from the Library of Congress, https://www.loc.gov/item/87693491/.
MLA citation style:
Geological Survey, U.S, et al. Economic geology sheet, Maryland--District of Columbia--Virginia, Washington quadrangle. [Washington?: U.S. Geological Survey, 1899] Map. Retrieved from the Library of Congress, <www.loc.gov/item/87693491/>.