Ravenstein, Ernst Georg, and Henry George Collins. "Collins' environs of Sebastopol, showing the position of the investing armies and also the plan of the battle-field of Alma." Map. London: Published by H.G. Collins, 22 Paternoster Row, [ca. 1854–1856]. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:ht250b225 (accessed April 19, 2024).