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  1. The health of our soils : toward sustainable agriculture in Canada /
    By: Acton, D. F. - Gregorich, L. J. - Canada. - Center for Land and Biological Resources Research (Canada)
    Publication info: [Ottawa] :Agriculture and Agri-Food Canada,1995.
    Contributed by: Agriculture and Agri-Food Canada (
    Subjects: Canada  Quality  Soil degradation  Soils  
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  2. Soil-depleting, soil-conserving, and soil-building crops /
    By: Pieters, A. J.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,[1938]
    Contributed by: 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  
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