scholarly journals The U.S. Geological Survey coal quality data base (COALQUAL)

1994 ◽  
Author(s):  
R.B. Finkelman ◽  
C.L. Oman ◽  
L.J. Bragg ◽  
S.J. Tewalt
Data Series ◽  
10.3133/ds975 ◽  
2015 ◽  
Author(s):  
Curtis A. Palmer ◽  
Charles L. Oman ◽  
Andy J. Park ◽  
James A. Luppens

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