Resumen de un estudio sobre ausencia de gonodotropina corionica en sueros de usuarias del D.I.V /

by Segal, Sheldon Jerome 1926-2009
Published 1986

World trends in contraceptive use, by method, and their relationship to fertility /

by Mauldin, Wayman Parker
Published 1988

Population : current status and policy options /

by Berelson, Bernard Reuben 1912-1979
Published 1979

Fertility and family planning : a world view /

by Coale, Ansley Johnson 1917-2002
Published 1969