@book{35199,
	author = {Open University. Bletchley, England},
	title = {La tierra, su forma, su estructura interna y su composición},
	publisher = {McGraw-Hill Latinoamericana,},
	year = {1974},
	series = {Curso básico de ciencias},
	address = {Colón, Panamá :},
	note = {Incluye impreso similar}
}