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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Hillman, F. H. - Henry, Helen H., - United States. Bureau of Plant Industry. Division of Seed Investigations.
    Edition: Revised
    Publication info: Washington, D.C, Division of Seed Investigations, Bureau of Plant Industry, U.S. Dept. of Agriculture, 1935
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library