Relief shown by hachures. LC Civil War maps (2nd  ed.), S9, S10, S11 Available also through the Library of Congress web site as raster image. LC copy imperfect: Map in 2 sections, mounted on paper.
Lindenkohl, A.; Lindenkohl, H. (Henry); Krebs, Charles G.; United States Coast Survey
<a rel="nofollow" class="external free" href="https://www.loc.gov/item/2004626029/">https://www.loc.gov/item/2004626029/</a>