Die karolingisch-ottonischen Bauten zu Werden
Effmann's 1899 German study of Carolingian and Ottonian buildings at Werden, published in Strassburg by Heitz for art historians and architects of the medieval church. The plates are measured architectural drawings: plans, sections and elevations with scale bars and German captions. Designers could borrow their crisp hatched masonry, arched bays and clean line-based plan layouts for historical graphics.
