1. Annual Book of ASTM Standards;American;Gaseous Fuels; Coal and Coke,1983
2. Coal resources of Wyoming;Berryhill;U.S. Geol. Surv., Circ.,1950
3. Late Cretaceous and Cenozoic history of Laramie Basin region, southeast Wyoming;Blackstone;Geol. Soc. Am., Mem.,1975
4. Stratigraphy of the Hanna Basin, Wyoming;Bowen;U.S. Geol. Surv., Prof. Pap.,1918
5. The constitution of an Australian Brown Coal Resin;Brooks;Fuel,1967