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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Walkden, H. H. (Herbert Halden),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1950
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  2. By: United States. Bureau of Entomology and Plant Quarantine. - Cotton, R. T. - Walkden, H. H. (Herbert Halden),
    Publication info: [S.l.], Bureau of Entomology and Plant Quarantine, Agricultural Research Administration, U.S. Dept. of Agriculture, 1952
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  3. By: Walkden, H. H. (Herbert Halden),
    Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1942
    Holding Institution: U.S. Department of Agriculture, National Agricultural Library
  1. By: Robinson, Wilfrid. - Walkden, H. H. (Herbert Halden),
    Type: Article
    In: Annals of botany
    Volume: 37
    Date: 1923-04
    Page Range: 299--324
    Publication Info: London, Academic Press [etc.],
  2. By: Walkden, H. H. (Herbert Halden),
    Type: Article
    In: Annals of botany
    Volume: 35
    Date: 1921-01
    Page Range: 137--138
    Publication Info: London, Academic Press [etc.],