Não informado. (1887). Bulletin of the Nebraska Agricultural Experiment Station. University of Nebraska, College of Agriculture.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of the Nebraska Agricultural Experiment Station. Lincoln, Neb: University of Nebraska, College of Agriculture, 1887.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of the Nebraska Agricultural Experiment Station. University of Nebraska, College of Agriculture, 1887.
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