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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Bonn, Richard I. - United States. Soil Conservation Service.
    Publication info: Portland, Or., Soil Conservation Service, 1971
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
    Subjects: Film catalogs  Natural history  
  2. By: Conservation Foundation. Audio-Visual Center.
    Edition: [3d ed.
    Publication info: Flanders, N.J, O'Hare Books], 1967
    Holding Institution: Prelinger Library
    Subjects: Conservation of natural resources  Film catalogs  Nonrenewable natural resources  Renewable natural resources  United States