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

United States congressional serial set ; serial set no. 6638;House document / 63rd Congress, 2nd session. House ; no. 307
 
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2

Contributions to economic geology (short papers and prelimi.. 

United States congressional serial set ; serial set no. 6415;House document / 62nd Congress, 3rd session. House ; no. 1426
 
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