Não informado. (1949). Progressive agriculture in Arizona. University of Arizona, College of Agriculture.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Progressive Agriculture in Arizona. Tucson, Ariz: University of Arizona, College of Agriculture, 1949.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Progressive Agriculture in Arizona. University of Arizona, College of Agriculture, 1949.
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