@book{30620,
	author = {Richards, Robert H. and Locke, Charles E.,},
	title = {Textbook of ore dressing /},
	publisher = {McGraw-Hill Book Company,},
	year = {1940.},
	address = {New York :},
	edition = {3d ed., completely rev. and rewritten.},
	note = {Includes index.}
}