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Webster, Ashley
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Contributions to economic geology (short papers and prelimi.. 

United States congressional serial set ; serial set no. 7504;House document / 65th Congress, 3rd session. House ; no. 1871
Ashley, George Hall ; Bowen, Charles F. ; Clark, Frank Rinker... , 1919
Link: http://docs.newsbank.com..
 
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Contributions to economic geology, 1908. Part II. -- Minera.. 

United States congressional serial set ; serial set no. 5464;House document / 60th Congress, 2nd session. House ; no. 1536
Anderson, Robert ; Ashley, George Hall ; Ball, Max W.... , 1909
Link: http://docs.newsbank.com..
 
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