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Imprint 1938
Available in Gale Academic OneFile.Available in Academic Search Complete.
Available in Gale OneFile: Gardening and Horticulture.
Available in JSTOR Life Sciences Archive Collection.
Available in Social Science Premium Collection.
Available in Gale Academic OneFile Select.
Available in Science Database.
Available in Education Database (ProQuest).
Available in Gale General OneFile.
Available in BioOne Complete.
Electronic
Journal