Eckles, C. H.2014-07-022014-07-021929-11Eckles, C.H. 1929. A Study of Breeding Records of Dairy Herds. Saint Paul, MN: University of Minnesota Agricultural Experiment Station. Bulletin 258.https://hdl.handle.net/11299/163684This archival publication may not reflect current scientific knowledge or recommendations. Current information available from University of Minnesota Agricultural Experiment Station: http://www.maes.umn.edu/en-USNewsletter or Bulletin