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Contributions to the study of coal: A proposed simplification of the Parr unit coal formula,

By Illinois State Geological Survey.
Urbana, Illinois, Printed by authority of the state of Illinois, 1934 .
99 p. , At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.

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Effect of preparation on ash fusibility of selected Illinois coals,

By McCabe, Louis Cordell,.
Urbana, Illinois, printed by authority of the state of Illinois, 1939 .
31 p. , At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.

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A study of the equilibration method of determining moisture in coal for classification by rank,

By Rees, Orin Wainwright,.
Urbana, Ill., Printed by authority of the state of Illinois, 1939 .
34 p. incl. illus., tables, diagrs. , At head of title: State of Illinois ... Department of Registration and Education ... Division of the State Geological Survey ... Urbana. 25 cm..

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Moisture relations of banded ingredients in an Illinois coal,

By Rees, Orin Wainwright,.
Urbana, Ill., 1941 .
10 p. incl. tables, diagrs. , At head of title: State of Illinois, Dwight H. Green, governor. Dept. of Registration and Education, Frank G. Thompson, director. Division of the State Geological Survey, M.M. Leighton, chief, Urbana ... | "Reprinted from Industrial and Engineering Chemistry, vol. 33, no. 3, March, 1941." 25 cm..

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Determination of ash in coals unusually high in calcite and pyrite,

By Rees, Orin Wainwright,.
Urbana, Ill., 1942 .
10p. , At head of title: State of Illinois, Dwight H. Green, governor. Dept. of registration and education, Frank G. Thompson, director. Division of the State geological survey, M.M. Leighton, chief, Urbana. | "Reprinted from Industrial and engineering chemistry, analytical edition, vol. 14, no. 3, March 15, 1942." 25cm..

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