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12
Thirty-eighth annual report of the National Advisory Commit..
United States congressional serial set ; serial set no. 11676;Senate document / 83rd Congress, 1st session. Senate ; no. 1
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13
Thirty-seventh annual report of the National Advisory Commi..
United States congressional serial set ; serial set no. 11595;Senate document / 82nd Congress, 2nd session. Senate ; no. 93
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14
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