WARD, C. R. (1983). Coal geology and coal technology - Edited Colin R. Ward. Blackwall Scientific Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWARD, Colin R. Coal Geology and Coal Technology - Edited Colin R. Ward. Blackwall Scientific Pub, 1983.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWARD, Colin R. Coal Geology and Coal Technology - Edited Colin R. Ward. Blackwall Scientific Pub, 1983.
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