Não informado. (1926). Yearbook of agriculture. U.S. Department of Agriculture.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Yearbook of Agriculture. Washington: U.S. Department of Agriculture, 1926.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Yearbook of Agriculture. U.S. Department of Agriculture, 1926.
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