Green, S. H. (1949). Industrial coal available to Pacific Northwest industries. Raw Materials Survey.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGreen, Stephen H. Industrial Coal Available to Pacific Northwest Industries. Portland, Or.: Raw Materials Survey, 1949.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGreen, Stephen H. Industrial Coal Available to Pacific Northwest Industries. Raw Materials Survey, 1949.
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