Columbia subject headings:
Harvard subject headings:
Albatrosses--Identification.
Albatrosses.
Petrels
Petrels--Identification.
Shearwaters
Shearwaters--Identification.
Princeton subject headings:
Albatrosses--Identification.
Albatrosses.
Petrels--Identification.
Petrels.
Shearwaters--Identification.
Shearwaters.