1. Introduction;Ahlgren,1974
2. New observations on the origin of fusain;Bode;Fuel,1928
3. Coal Petrology: Its Principles, Methods and Applications;Bustin;Geol. Assoc. Can. Short Course Notes,1983
4. The ecology of Sphagnum;Clymo,1982
5. Petrology of some Holocene peat sediments from the Okefenokee swampmarsh complex of southern Georgia;Cohen;Geol. Soc. Am. Bull.,1973