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1
Contributions to economic geology (short papers and prelimi..
United States congressional serial set ; serial set no. 6650;House document / 63rd Congress, 2nd session. House ; no. 786
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2
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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3
Contributions to economic geology (short papers and prelimi..
United States congressional serial set ; serial set no. 6637;House document / 63rd Congress, 2nd session. House ; no. 306
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4
Forty-first annual report of the National Advisory Committe..
United States congressional serial set ; serial set no. 11917;Senate document / 84th Congress, 2nd session. Senate ; no. 90