Columbia subject headings:
Antiarchi.
Fishes--Scotland.
Microbrachius.
Paleontology--Devonian.
Pterichthyodes.
Harvard subject headings:
Paleontology--Devonian
Paleontology--Scotland.
Placodermi.
Princeton subject headings:
Antiarchi.
Paleontology--Devonian.
Paleontology--Scotland.