@book{29525,
	author = {Greenberg, Seymour Samuel,},
	title = {Petrography of Indiana sandstones collected for high-silica evaluation /},
	publisher = {State of Indiana, Dept. of Conservation, Geological Survey,},
	year = {1960.},
	series = {Indiana. Geological Survey. Bulletin},
	address = {Bloomington :}
}