http://pec.lib.wvu.edu/record/P8557[1924?]Facts you should know about coal and coke in West Virginia : important data in regard to the production and selling price of coal and coke in West Virginia from 1897 to 1923, inclusive.Leaflet. "Compiled from Reports of the Chief of Department of Mines of West Virginia, by Clark & Krebs, Inc. File no. 9001."<br />Clark and Krebs (Firm)Coke industry--West Virginia--Statistics.Coal mines and mining--West Virginia--Statistics.14256