@book{112926,
	author = {Lugo-López, M A. and Puerto Rico. Estación Experimental Agrícola, Río Piedras.},
	title = {Nature and properties of major soils of Lajas Valley},
	publisher = {University of Puerto Rico. Agricultural Experiment Station},
	year = {1959.},
	series = {Agricultural Experiment Station, Río Piedras. Bulletin},
	address = {Río Piedras, P. R.}
}