@book{20267,
	author = {Araujo Aguilar, Rogelio.},
	title = {Distrito de riego de San Juan del Río, Qro. sifón en Km. 30-253.53 del canal principal},
	publisher = {Ela turo,},
	year = {1948},
	address = {Chapingo, Méx., :}
}