@book{89943,
	author = {Combs, Jerry Walker, 1913-},
	title = {Human fertility in Puerto Rico / Jerry Walker Combs.},
	publisher = {University Microfilms},
	year = {1954.},
	series = {[Doctoral dissertation series. Publication no. : 10, 259]},
	address = {Ann Arbor, Mich.}
}