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  1. Preliminary report on control of San Jose scale with lubricating-oil emulsion /
    By: Ackerman, A. J.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1923.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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  2. Two leafhoppers injurious to apple nursery stock /
    By: Ackerman, A. J.
    Publication info: Washington, D.C. :U.S. Dept. of Agriculture,1919.
    Contributed by: U.S. Department of Agriculture, National Agricultural Library
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