United States. Soil Conservation Service. Pacific Northwest erosion control projects: Annual report.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रUnited States. Soil Conservation Service. Pacific Northwest Erosion Control Projects: Annual Report. [Spokane, Wash.?].
एमएलए (8वां संस्करण) प्रशस्ति पत्रUnited States. Soil Conservation Service. Pacific Northwest Erosion Control Projects: Annual Report.
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