Columbia subject headings:
Harvard subject headings:
Cnidaria--Cytology--Congresses.
Cnidaria--Reproduction--Congresses.
Ctenophora--Cytology--Congresses.
Ctenophora--Reproduction--Congresses.
Princeton subject headings:
Cnidaria--Cytology--Congresses.
Cnidaria--Reproduction--Congresses.
Ctenophora--Cytology--Congresses.
Ctenophora--Reproduction--Congresses.