U.S. Geological Survey coal quality (COALQUAL) database; version 2.0

1997 ◽  
Author(s):  
L.J. Bragg ◽  
J.K. Oman ◽  
S.J. Tewalt ◽  
C.L. Oman ◽  
N.H. Rega ◽  
...  
Data Series ◽  
10.3133/ds975 ◽  
2015 ◽  
Author(s):  
Curtis A. Palmer ◽  
Charles L. Oman ◽  
Andy J. Park ◽  
James A. Luppens

2014 ◽  
Author(s):  
C Deblonde ◽  
A Plouffe ◽  
S Eagles ◽  
D Everett ◽  
D H Huntley ◽  
...  

1992 ◽  
Author(s):  
Lindrith E. Cordell ◽  
Jeffrey D. Phillips ◽  
Richard H. Godson

1992 ◽  
Author(s):  
Lindrith E. Cordell ◽  
Jeffrey D. Phillips ◽  
Richard H. Godson

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