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United States Bureau of Mines Bulletin 622
From Introduction: "This bulletin presents results of laboratory experiments performed between 1944 and 1956, which have particularly sought to improve the conversion of coal to liquids in small batch-type high-pressure reactors (autoclaves).
Hydrorefining coal-oils to fuels for supersonic aircraft /
Includes bibliographical references.Mode of access: Internet
A coal-fired water pump /
Includes bibliographical references (p. 12).Mode of access: Internet