Bruce, Twenty years ago I picked up a thin color illustrated book on the progression of several northern Italian bikes including Guerciottis from their first bikes through the early 1980s. Front and rear views on the left pages, drive side views on the right, shot on a white drop with some text up front. It was at an all-night bookstore in the Village, (NYC). Didn't buy it or take down any info but it did exist then. Amazon? Abebooks.com? Daedalus Books? =Den