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  1. Effectiveness of extension in reaching rural people : a study of 3,954 farms in Iowa, New York, Colorado, and California, 1923-24
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1926
  2. Department bulletin
    Publication info: Washington, D.C, Supt. of Docs., G.P.O, 1923-1929