Não informado. West Virginia Agriculture and Forestry. University of West Virginia, College of Agriculture and Forestry.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. West Virginia Agriculture and Forestry. Morgantown, Wa. Va: University of West Virginia, College of Agriculture and Forestry.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. West Virginia Agriculture and Forestry. University of West Virginia, College of Agriculture and Forestry.
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