Leighton, M. M. (1919). The road building sands and gravels of Washington. F. M. Lamborn, public printer.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLeighton, Morris M. The Road Building Sands and Gravels of Washington. Olympia: F. M. Lamborn, public printer, 1919.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLeighton, Morris M. The Road Building Sands and Gravels of Washington. F. M. Lamborn, public printer, 1919.
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