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

by: Illinois State Geological Survey; Thiessen, Gilbert, 1905-; Cady, Gilbert H. (Gilbert Haven), b. 1882; Rees, Orin Wainwright, 1898-; Reed, Frank Hynes, 1890-

Publication date: 1934

Topics: Coal, Coal

Publisher: Urbana, Illinois, Printed by authority of the State of Illinois

Collection: university_of_illinois_urbana-champaign; americana

Contributor: University of Illinois Urbana-Champaign

Language: English

Volume: 557 Ilre no.32

At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey

A proposed simplification of the Parr Unit coal formula / Gilbert Thiessen -- Ash-to-mineral matter correction in coal analyses / Gilbert Thiessen -- Unit coal as a basis of coal standardization as applied to Illinois coals / G.H. Cady and O.W. Rees -- Studies of the graphical method of calculating pure coal calorific value / Gilbert Thiessen and Frank H. Reed