Columbia subject headings:
Fertility--Congresses.
Oviduct--Congresses.
Ovum--Congresses.
Symposium on Ovum Transport and Fertility Regulation (1975 : University of Texas at San Antonio)
Harvard subject headings:
Contraception--Congresses
Fertility, Human--Congresses
Oviduct--Congresses.
Ovum--Congresses.
Princeton subject headings: