Washington (State). Division of Geology and Earth Resources & Washington (State). Division of Mines and Geology. Bibliography and index of the geology and mineral resources of Washington. The Department.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWashington (State). Division of Geology and Earth Resources और Washington (State). Division of Mines and Geology. Bibliography and Index of the Geology and Mineral Resources of Washington. [Olympia, Wash.]: The Department.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWashington (State). Division of Geology and Earth Resources और Washington (State). Division of Mines and Geology. Bibliography and Index of the Geology and Mineral Resources of Washington. The Department.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.