Cologne, Published by J. & W. Boisserée, 1901, format 195x120mm , broché, 136 pages, illustrations in et hors-texte, dos légèrement bruni sinon bon exemplaire.
A Guide for visitors, compiled from historical and descriptive records as well as the official reports of the building committee.Translated from the german by Capt. J.W. Watkins ( Late) R.A. .