Não informado. (1941). Crop Production. Department of Agriculture, Statistical Reporting Service.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Crop Production. Washington: Department of Agriculture, Statistical Reporting Service, 1941.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Crop Production. Department of Agriculture, Statistical Reporting Service, 1941.
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