Kirkham, V. R. D. (1935). Natural gas in Washington, Idaho, eastern Oregon, and northern Utah. American Society of Petroleum Geologists.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रKirkham, Virgil R. D. Natural Gas in Washington, Idaho, Eastern Oregon, and Northern Utah. [n.p.]: American Society of Petroleum Geologists, 1935.
एमएलए (8वां संस्करण) प्रशस्ति पत्रKirkham, Virgil R. D. Natural Gas in Washington, Idaho, Eastern Oregon, and Northern Utah. American Society of Petroleum Geologists, 1935.
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