@book{112437,
	author = {United States and Roberts, R.C. and Puerto Rico.},
	title = {Puerto Rico},
	publisher = {Department of Agriculture, Bureau of Plant Industry},
	year = {19-},
	series = {Serie : 1936-},
	address = {Washington, D.C.},
	note = {Published with the cooperation of University of Puerto Rico Agricultural Experiment Station.}
}