Columbia subject headings:
Harvard subject headings:
Lungfishes, Fossil--Congresses.
Lungfishes, Fossil--Evolution--Congresses.
Lungfishes--Congresses.
Lungfishes--Evolution--Congresses.
Princeton subject headings:
Lung-fishes, Fossil--Congresses.
Lung-fishes, Fossil--Evolution--Congresses.
Lungfishes--Congresses.
Lungfishes--Evolution--Congresses.