Columbia subject headings:
Harvard subject headings:
Cetacea populations--Estimates--Congresses.
Cetacea--Congresses.
Cetacea--Identification--Congresses.
Cetacea--Photographic identification--Congresses.
Population biology--Congresses
Whales--Congresses.
Princeton subject headings:
Cetacea populations--Congresses.
Cetacea--Identification--Technique--Congresses.
Population biology--Congresses.