Schwantes, A.J.Ives, Norton2015-10-112015-10-111943-06A. J. Schwantes and Norton Ives. Costs of Tractor and Machine Use. University of Minnesota Extension Service. Extension Pamphlet 96. June 1943https://hdl.handle.net/11299/174661This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.enNewsletter or Bulletin