Map of siege operations against the defenses of Charleston harbor, 1863: showing batteries covering the descent upon Morris Island, July 10, and the subsequent operations resulting in the demolition of Ft. Sumter and the capture of Ft. Wagner & Batty. Gregg, September 7., map, [1891..1895]; (https://texashistory.unt.edu/ark:/67531/metapth298643/m1/1/: accessed April 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .