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By: United States. Bureau of Entomology and Plant Quarantine. - Cotton, R. T. - Walkden, H. H. (Herbert Halden),Edition:Publication info: [S.l.], Bureau of Entomology and Plant Quarantine, Agricultural Research Administration, U.S. Dept. of Agriculture, 1952Volume: no.24Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects:BHL Collections:
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By: Walkden, H. H. (Herbert Halden),Edition:Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1950Volume: no.849Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects:BHL Collections:
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By: Walkden, H. H. (Herbert Halden),Edition:Publication info: Washington, D.C, U.S. Dept. of Agriculture, 1942Volume: no.643Series:Holding Institution: U.S. Department of Agriculture, National Agricultural LibrarySubjects:BHL Collections:
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By: Robinson, Wilfrid. - Walkden, H. H. (Herbert Halden),Type: ArticleIn: Annals of botanyVolume: 37Series:Issue:Date: 1923-04Page Range: 299--324Publication Info: London, Academic Press [etc.],Subjects:
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By: Walkden, H. H. (Herbert Halden),Type: ArticleIn: Annals of botanyVolume: 35Series:Issue:Date: 1921-01Page Range: 137--138Publication Info: London, Academic Press [etc.],Subjects: