@book{110248,
	author = {Roberts, Ray Carlton and United States},
	title = {Soil survey, Puerto Rico ... Department of Agriculture, Bureau of Plant Industry in cooperation with the University of Puerto Rico Agricultural Experiment Station.},
	publisher = {[U.S. Govt. Print. Off.},
	year = {1942]},
	series = {United States. Bureau of Plant Industry [Soil survey report] Series 1936, no. 8},
	address = {Washington},
	note = {Cover title.}
}