@book{27430,
	author = {American Institute of Mining, Metallurgical, and Petroleum Engineers and Lefond, Stanley J., },
	title = { Industrial Minerals And Rocks : Nonmetallics Other Than Fuels /},
	publisher = {Society of Mining Engineers ,},
	year = {1975},
	address = {New York :},
	edition = {4th.ed.}
}