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Geology and ore deposits of the Leadville mining district, .. 

United States congressional serial set ; serial set no. 8620;House document / 69th Congress, 1st session. House ; no. 397
Emmons, Samuel Franklin ; Irving, John Duer ; Loughlin, G.F. , 1926
Link: http://docs.newsbank.com/select/serialset/11C38F5A9E89..