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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Davidson, W. M. - Nougaret, R. L. (Raymond Louis),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1921
    Holding Institution: Multiple institutions
  2. By: Nougaret, R. L. (Raymond Louis), - Davidson, W. M. - Newcomer, E. J. (Erval Jackson),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1916
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library