TY  - BOOK
A1  - Ventura, S.J.
A1  - Abma, J.C.
A1  - Mosher, W.D.
A1  - Henshaw, S.K. 
T1  - Estimated Pregnancy Rates by Outcome for the United States, 1990-2004
Y1  - 2008
T3  - National Vital Statistics Reports 

ER  -