Geologic map of anthracite-bearing rocks in the north part of the Orwigsburg Quadrangle, Schuylkill County, Pennsylvania

10.3133/i689 ◽  
1972 ◽  
Keyword(s):  
1994 ◽  
Author(s):  
R.B. Colton ◽  
J.P. McGraw ◽  
D.K. Bozeman
Keyword(s):  

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