@book{76804,
	author = {Ewel, John J. and Ewel, John J. and Puerto Rico.},
	title = {Las zonas de vida de Puerto Rico y las Islas Virgenes Americanas},
	publisher = {Institute of Tropical Forestry},
	year = {1973.},
	series = {Boletín de Investigación del Servicio Forestal ITF ; 18A},
	address = {Rio Piedras, P.R.},
	note = {Translation of the ecological life zones of Puerto Rico and the U.S. Virgin Islands.}
}