New perspectives on the Paleozoic history of the upper Mississippi Valley: an examination of the Plum River Fault Zone, G. A. Ludvigson and B. J. Bunker, 1989, 251 p., 3 parts. The Guidebook Series includes guidebooks for field trips sponsored by the Iowa Geological Survey or co-sponsored with various organizations such as the Geological Society of America, the Geological Society of Iowa, and the Iowa Academy of Science.