Angela R. Collins; Lynn M. Alex; Cynthia Peterson; David Benn; Leah Rogers; John Doershuk (July 2012). "Archaeology on the Road"(PDF). Office of the State Archaeologist, University of Iowa. Archived from the original(PDF) on January 1, 2017. Retrieved April 29, 2022.
Angela R. Collins; Lynn M. Alex; Cynthia Peterson; David Benn; Leah Rogers; John Doershuk (July 2012). "Archaeology on the Road"(PDF). Office of the State Archaeologist, University of Iowa. Archived from the original(PDF) on January 1, 2017. Retrieved April 29, 2022.
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Amato, Joseph Anthony. (1990). Servants of the land : God, family, and farm: the trinity of Belgian economic folkways in southwestern Minnesota. Longmont, Colo.: Crossings Press. ISBN0-9614119-2-9. OCLC24039158.