Columbia subject headings:
Fishes--Identification.
Fishes--North America--Identification.
Sharks--Identification.
Sharks--North America--Identification.
Harvard subject headings:
Fishes--Identification.
Fishes--North America--Identification.
Sharks--Identification.
Sharks--North America--Identification.
Princeton subject headings:
Fishes--Identification.
Fishes--North America--Identification.
Sharks--Identification.
Sharks--North America--Identification.