@book{27821,
	author = {Rees, Orin Wainwright, and Selvig, W. A. and United States.},
	title = {Determination of ash in coals unusually high in calcite and pyrite,},
	year = {1942.},
	series = {Illinois.  State geological survey.  Report of investigations},
	address = {Urbana, Ill.,},
	note = {At head of title: State of Illinois, Dwight H. Green, governor.  Dept. of registration and education, Frank G. Thompson, director.  Division of the State geological survey, M.M. Leighton, chief, Urbana.}
}