@book{29031,
	author = {De Long, Richard M. and Ohio.},
	title = {The Pittsburgh no. 8 and Redstone no. 8A coal beds in Ohio /},
	publisher = {State of Ohio, Dept. of Natural Resources, Division of Geological Survey,},
	year = {1955.},
	series = {Report of investigations ;},
	address = {Columbus :}
}