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  1. Onion smudge,
    By: Walker, J. C.
    Publication info: Washington,Govt. print. off.,1921.
    Contributed by: Library of Congress
    BHL Collections: Library of Congress
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  2. Seed treatment and rainfall in relation to the control of cabbage black-leg /
    By: Walker, J. C.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1922.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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