@book{19414,
	author = {Nieuwenkamp, W.},
	title = {Stereograms for the determination of plagioclase feldspars in random sections},
	publisher = {Elsevier Publishing Cy.,},
	year = {1966.},
	address = {Amsterdam :},
	note = {"Sole distributers for the U.S.A. and Canada: American Elsevier Publishing Company ... New York."}
}