Campbell, C. D. (1953). Introduction to Washington geology and resources. State College of Washington.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCampbell, Charles D. Introduction to Washington Geology and Resources. Pullman: State College of Washington, 1953.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCampbell, Charles D. Introduction to Washington Geology and Resources. State College of Washington, 1953.
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