"Stannard & Son's, panoramic birds-eye view of the French & Prussian provinces, on the banks of the Rhine, shewing all the fortresses belonging to each army, with the railways & frontier boundaries of each country." Map. London: Stannard & Son, 1870. Norman B. Leventhal Map & Education Center, https://collections.leventhalmap.org/search/commonwealth:x059cb30c (accessed May 14, 2024).