@book{27276,
	author = {Williams, Robert S. and Homerberg, Victor Oliver,},
	title = {Principles of metallography /},
	publisher = {McGraw-Hill Book,},
	year = {1948.},
	series = {Metallurgy and metallurgical engineering series},
	address = {New York :},
	edition = {5th ed.},
	note = {Includes index.}
}