Contributions to the study of coal
Subtitle: A proposed simplification of the Parr unit coal formula
By: by Gilbert Thiessen. Ash-to-mineral matter correction in coal analyses, by Gilbert Thiessen. Unit coal as a basis of coal standardization as applied to Illinois coals, by G. H. Cady and O. W. Rees. Studies of the graphical method of calculating pure coal calorific value, by Gilbert Thiessen and Frank H. Reed.
Contributors: Thiessen, Gilbert, 1905-; Cady, Gilbert H. b. 1882.; Rees, Orin Wainwright, 1898-; Reed, Frank Hynes, 1890-
Series: Its Report of investigations; no. 32
Publisher: Printed by authority of the state of Illinois
Published: 1934
Place of publication: Urbana, Illinois
Language: eng
Number of pages: 99
Subjects: Coal -- Analysis.; Coal -- Illinois.
Notes: At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey.