@book{27428,
	author = {American Institute of Mining, Metallurgical, and Petroleum Engineers and Lefond, Stanley J., },
	title = { Industrial Minerals And Rocks : Nonmetallics Other Than Fuels - Volume 1 /},
	publisher = {Society Of Mining Engineers},
	year = {1983},
	address = {New York :},
	edition = {5th.ed.}
}