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4
Geology and coal resources of North Park, Colorado. By A.L...
United States congressional serial set ; serial set no. 6658;House document / 63rd Congress, 2nd session. House ; no. 1072
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5
Geology of the Standing Rock and Cheyenne River Indian Rese..
United States congressional serial set ; serial set no. 6647;House document / 63rd Congress, 2nd session. House ; no. 780
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6
Contributions to economic geology (short papers and prelimi..
United States congressional serial set ; serial set no. 5991;House document / 61st Congress, 3rd session. House ; no. 1465