Não informado. (1952). Nebraska Experiment Station Quarterly. Nebraska Agricultural Experiment Station.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Nebraska Experiment Station Quarterly. Lincoln, Neb: Nebraska Agricultural Experiment Station, 1952.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Nebraska Experiment Station Quarterly. Nebraska Agricultural Experiment Station, 1952.
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