File:Koeln In Bildern, Tafel 32. Das Eigelsteinthor.jpg
The image was photographed from the album Koeln in Bildern. This album was issued in 1896 by Paul Neubner publishing house, Cologne, Germany. The photographers were not identified by name, all images were collotyped by Schaar & Dathe in Trier, Germany. All companies involved are defunct, and numerous catalogues of libraries and old book shops didn't provide any information about the photographers.