@book{32704,
	author = {Opazo Gutiérrez, Mario},
	title = {Tecnologías Alternativas: Soluciones Locales /},
	publisher = {El Colegio Verde de Villa de Leyva,},
	year = {1992.},
	series = {Ecoguías No.4},
	address = {Santafe de Bogotá :}
}