E13: Carboniferous and Coal in the Ruhr Valley

Author(s):  
Volker Wrede
Keyword(s):  
2000 ◽  
Vol 105 (2) ◽  
pp. 632
Author(s):  
Andrew Lees ◽  
James H. Jackson
Keyword(s):  

1923 ◽  
Vol 17 (4) ◽  
pp. 724-733
Author(s):  
George A. Finch
Keyword(s):  

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