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Contributions to economic geology (short papers and prelimi.. 

United States congressional serial set ; serial set no. 8606;House document / 69th Congress, 1st session. House ; no. 90
Knopf, Adolph ; Lang, Walter B. ; Loughlin, G.F... , 1926
Link: http://docs.newsbank.com/select/serialset/11C2ABDC4272..