The women and their pregnancies the Collaborative Perinatal Study of the National Institute of Neurological Diseases and Stroke - Niswander, Kenneth R. 1924-; National Institute of Neurological Diseases and Stroke; Gordon, Myron (Philadelphia Saunders, 1972)
"Characteristics and conditions of pregnancy, by institution": (microfiche. 2 sheets 11 x 15 cm.) in pocket.
Keywords: Childbirth -- Statistics; Childbirth -- Statistics. -- United States; Collaborative Perinatal Project (U.S.); Pregnancy -- Complications -- Statistics; Pregnancy -- Complications -- Statistics. -- United States; Pregnancy -- Statistics; Pregnancy -- Statistics. -- United States; United States -- Statistics, Medical