The original file and additional information on the location of the hard-copy and other citation information are available at the following link:
Library of Congress Page with Citation and Original File Link
Full Citation
Hotchkiss, Jedediah. Map of Rockingham County, Virginia 1875, Library of Congress Geography and Map Division, Washington, D.C., Published by authority of the U.S. Army, 1875. Map. https://www.loc.gov/item/2010587010/.