TY  - BOOK
ED  - Andros, S. O.
ED  - Illinois State Geological Survey.
ED  - University of Illinois (Urbana-Champaign campus).
ED  - United States.
TI  - Mining practice in district I: (Longwall) 
AV  - TN805.I3 A4 no. 5
PY  - 1914///
CY  - Urbana, [Ill.]
PB  - University of Illinois
KW  - Coal mines and mining
KW  - Illinois
N1  - Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering of the University of Illinois, and U. S. Bureau of Mines; Field work by S. O. Andros and J. J. Rutledge
ER  -