Colorado Agricultural College. Extension Service. Annual report, Washington County.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रColorado Agricultural College. Extension Service. Annual Report, Washington County.
एमएलए (8वां संस्करण) प्रशस्ति पत्रColorado Agricultural College. Extension Service. Annual Report, Washington County.
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