@book{25370,
	author = {Andros, S. O. and Illinois State Geological Survey.},
	title = {Coal mining practice in district VII /},
	publisher = {University of Illinois,},
	year = {1914.},
	address = {Urbana, Ill. :},
	note = {Prepared under a cooperative agreement between State Geological Survey, Dept. of Mining Engineering of the University of Illinois, U. S. Bureau of Mines.}
}