Die Kunstdenkmaler des Kreises Mulheim am Rhein ..
A German art-historical survey of church buildings in the Mülheim district of the Rhine Province, compiled by Paul Clemen and Edmund Renard and published in Düsseldorf in 1901 for scholars and architects studying regional monuments. The pictures are black-and-white ground plans and sections of churches, with thick black walls, open nave bays, and apses drawn in plain line. A designer could take from them a clear, diagrammatic way of showing architectural structure using solid masses, dashed vaulting lines, and simple labelled elevations.
