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1. The constitution of pinnacle bed coal from Hayden mine, Haybro, Routt county, Colorado
   May, Timothy Crawford
   TN805.C6 M2
2. Statistics of coal in Illinois : a supplemental report of the State Bureau of Labor Statistics
   TN805.I3 A2 no.12 1892-1893
3. Annual report of the State Bureau of Labor Statistics, coal in Illinois
   TN805.I3 A2 no.13 1893-1894
4. Annual coal report
   TN805.I3 A2 no.19 1899-1900
5. Annual coal report of Illinois
   TN805.I3 A2 no.30 1910-1911