@book{110461,
	author = {Puerto Rico.},
	title = {Graphs on health progress in Puerto Rico during the present century.},
	publisher = {[Section of Biostatistics. Dept.of Preventine medicine... University of Puerto Rico]},
	year = {1960.},
	address = {San Juan, P. R.},
	note = {Cover title : Health progress in Puerto Rico.}
}