"Map of the Mississippi River, from Cairo to the Gulf of Mexico, showing the position of the rebel fortifications at the mouth of the River, those already taken and those remaining to be captured, etc." Map. New York: G. Woolworth Colton, 1862. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:kk91fs62t (accessed April 19, 2024).