TY  - BOOK
AU  - Thiessen,Gilbert
AU  - Cady,Gilbert H.
AU  - Rees,Orin Wainwright
AU  - Reed,Frank Hynes
ED  - Illinois State Geological Survey
TI  - Contributions to the study of coal: A proposed simplification of the Parr unit coal formula,
T2  - Its Report of investigations
AV  - TP325 .I63 1934
PY  - 1934///
CY  - Urbana, Illinois
PB  - Printed by authority of the state of Illinois
KW  - Coal
KW  - Analysis
KW  - Illinois
N1  - At head of title: State of Illinois. Department of Registration and Education. Division of the State Geological Survey
ER  -