@book{68853,
	author = {Arenas Rivera, Rogelio.},
	title = {Estrategias para la explotación racional del acuífero de la Laguna Seca en Guanajuato},
	publisher = {El autor,},
	year = {1989},
	address = {Chapingo, Méx. :},
	note = {32-1}
}