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  1. By: United States. Soil Conservation Service.
    Publication info: S.l, s.n, n.d
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Animal behavior  Animal ecology  Soil conservation  soil resource management  Soil science  
  2. By: Pieters, A. J. (Adrian John),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, [1938]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: AgSpace  conservation plants  Crops and soils  Grasses  Internet resource  Soil conservation  Soil degradation  Soil management  soil organic matter  soil quality  soil resource management