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  1. The essentials of soil fertility,
    By: Agee, Alva,
    Edition: [4th ed.]
    Publication info: Pittsburgh, Pa.,The Stockman-farmer publishing company[1913]
    Contributed by: Library of Congress
    Subjects: Fertilizers  Soil fertility  
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  2. Fertility of soils as affected by manures. By Frank D. Gardner.
    By: Gardner, Frank D.
    Publication info: Washington,Govt. Print. Off.,1908.
    Contributed by: Library of Congress
    Subjects: Fertilizers  Soil fertility  
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  3. First principles of soil fertility,
    By: Vivian, Alfred,
    Publication info: New York,O. Judd company; [etc., etc.]1908.
    Contributed by: Library of Congress
    Subjects: Manures  Soil fertility  
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  4. Question summary to accompany "Soil fertility and permanent agriculture,"
    By: Hopkins, Cyril G.
    Publication info: Boston,Ginn and company,c1912.
    Contributed by: Library of Congress
    Subjects: Fertilizers  Soil fertility  
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  5. Soil fertility and permanent agriculture, by Cyril G. Hopkins ...
    By: Hopkins, Cyril G.
    Publication info: Boston,Ginn,[c1910]
    Contributed by: University of California Libraries (archive.org)
    Subjects: Fertilizers  Manures  Soil fertility  Soils  
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  6. Soil fertility and permanent agriculture.
    By: Hopkins, Cyril George,
    Publication info: BostonGinn[1910]
    Contributed by: Robarts - University of Toronto (archive.org)
    Subjects: Fertilizers and manures  Soil fertility  
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  7. Soil fertility laboratory manual,
    By: Hopkins, Cyril George, - Pettit, James Harvey,
    Publication info: BostonGinn[c1910]
    Contributed by: Earth Sciences - University of Toronto (archive.org)
    Subjects: Laboratory manuals  Soil fertility  Soil science  
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