Relief shown by hachures. Prime meridians: Washington, D.C. and London. LC copy mounted on cloth. Stamped on in lower left corner: 108B Available also through the Library of Congress Web site as a raster image.
Sotzmann, D. F.; Sander, Wilhelm
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/2018590100/">https://www.loc.gov/item/2018590100/</a>