Não informado. (1889). Bulletin of the Virginia Agricultural Experiment Station. Virginia Polytechnic Institute.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Bulletin of the Virginia Agricultural Experiment Station. Blacksburg, Va: Virginia Polytechnic Institute, 1889.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Bulletin of the Virginia Agricultural Experiment Station. Virginia Polytechnic Institute, 1889.
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