KÖLN:

Stadtplan (‚Plan de Cologne de L‘Atlas Universel'), Farblithographie v. R. Hausermann n. R. Barbot aus Atlas Universel b. Fayard, 1877, 20 x 26 cm

Tooley's Dic. of Mapm. Rev. Ed. A - D, S. 289 (R. Hausermann, draughtsman and engraver of Paris. …).