Columbia subject headings:
Paleontology--Paleozoic--Congresses.
Vertebrates, Fossil--Congresses.
Vertebrates--Evolution--Congresses.
Harvard subject headings:
Paleontology--Paleozoic--Congresses.
Vertebrates, Fossil--Congresses.
Vertebrates--Evolution--Congresses.
Princeton subject headings:
Paleontology--Paleozoic--Congresses.
Vertebrates, Fossil--Congresses.
Vertebrates--Evolution--Congresses.