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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Ackerman, William L. - Joley, Lloyd E. - Halsey, Dean. - United States. Bureau of Plant Industry, Soils, and Agricultural Engineering.
    Publication info: [Washington, D.C.], Bureau of Plant Industry, Soils and Agricultural Engineering, U.S. Department of Agriculture, [1955]
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library