Johann Josef Böker's new book stands as a coda of sorts to one of the most significant publishing enterprises in medieval architecture undertaken in recent years. Two decades ago, Böker began to study the hundreds of medieval architectural drawings in the Academy of Fine Arts in Vienna, by far the largest such collection in the world. His lavishly produced catalogue of this collection appeared in 2005, followed by two similarly grand volumes written with a group of younger colleagues, the first published in 2011 on drawings from Ulm and the Danube region, the second in 2013 on drawings from the Rhineland. With their superb illustrations and comprehensive...

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