@book{98200,
	author = {Secretaria de Energia, Minas e Industria Paraestatal},
	title = {Anuario Estadistico de la Mineria Mexicana 1989},
	publisher = {Consejo de Recursos Minerales,},
	year = {1991},
	address = {Pachuca, Hgo, México :},
	edition = {1a ed.}
}