Contributions to economic geology, 1910, Part II, Mineral fuels--Miscellaneous analyses of coal samples from various fields of the United States

10.3133/b471j ◽  
1912 ◽  
1894 ◽  
Vol 2 (2) ◽  
pp. 226-231
Author(s):  
R. A. F. Penrose

1894 ◽  
Vol 2 (4) ◽  
pp. 242-242
Author(s):  
Albert P. Brigham

1906 ◽  
Vol 38 (6) ◽  
pp. 393
Author(s):  
A. P. B. ◽  
Heinrich Ries

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