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Robert A. Birmingham is the author of Spirits of Earth: The Effigy Mound Landscape of Madison and the Four Lakes and the coauthor of Aztalan: Mysteries of an Ancient Indian Town . Now retired, he served as the state archaeologist of Wisconsin for many years and received the Increase Lapham Research Medal from the Wisconsin Archeological Society. Amy L. Rosebrough is a Wisconsin archaeologist and the coauthor of Water Panthers, Bears, and Thunderbirds: Exploring Wisconsin's Effigy Mounds .