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12
Minerals Yearbook, 1936. Compiled under the supervision of ..
United States congressional serial set ; serial set no. 10142;House document / 75th Congress, 1st session. House ; no. 42
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13
Minerals Yearbook, 1937. Compiled under the supervision of ..
United States congressional serial set ; serial set no. 10143;House document / 75th Congress, 1st session. House ; no. 320