Relief shown pictorially. "Gridley, sc." From: Carey's General atlas, 1818. Prime meridian: Philadelphia and London. LC Trails, 42 Available also through the Library of Congress Web site as a raster image.
Gridley, Enoch G.; Carey, Mathew
1818
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/2006635240/">https://www.loc.gov/item/2006635240/</a>