@book{13097,
	author = {Williams, Howel and Gilbert, Charles M.},
	title = {Petrografía :},
	publisher = {Cecsa,},
	year = {1968.},
	address = {México :},
	note = {5225 Ej.4 reempl.ING.797 - Ej.6. Ej.7 en Sala de Geociencias. ING.7035 lo posee la Sala de Geociencias.}
}