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  1. Principles and methods of soil analysis. [By] Edgar Richards ...
    By: Richards, Edgar.
    Publication info: Washington,Govt. print. off.,1886.
    Contributed by: Library of Congress
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  2. Principles and methods of soil analysis. [By] Edgar Richards ...
    By: Richards, Edgar.
    Publication info: Washington,Govt. print. off.,1886.
    Contributed by: University of California Libraries (archive.org)
    View Book