Não informado. Extension bulletin. Oregon Agricultural College Extension Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Extension Bulletin. Corvallis, Ore: Oregon Agricultural College Extension Service.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Extension Bulletin. Oregon Agricultural College Extension Service.
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