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Historique
Doug Birk’s investigations of mounds in Minnesota began in the 1970s but was renewed in the early 1980s when he and Elden Johnson became interested in new, non-destructive methods of studying mounds. Birk continued work on mounds throughout the 1990s and beyond with many other colleagues. Areas with mounds covered by this series include Cass, Morrison, LeSueur, Aitkin, Carlton, Koochiching, St. Louis, Itasca and Crow Wing Counties; Mississippi Headwaters; Pillager Gap; Pine River; Mille Lacs; Various lakes such as Gull, Leech, Cross, Norway and Rice; Also Rice Lake National Wildlife Refuge.