Image Source
Kauffer, Franz, and Jean Baptiste Lechavalier. "Plan de Constantinople, Levé Par F. Kauffer et J. B. Lechevalier. Plan von Constantinopel, etc. 43990. (9.)." British Library: 19th Century European Sheet Maps, Primary Source Media, 1812. Nineteenth Century Collections Online, tinyurl.galegroup.com/tinyurl/4Fxqx7. Accessed 1 Feb. 2017.