Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Cretaceous--Congresses
Geology, Stratigraphic--Tertiary--Congresses.
Geology--Denmark--Congresses.
Paleontology--Cretaceous--Congresses.
Paleontology--Denmark--Congresses.
Paleontology--Tertiary--Congresses.
Princeton subject headings:
Geology, Stratigraphic--Cretaceous--Congresses.
Geology, Stratigraphic--Tertiary--Congresses.
Geology--Denmark--Congresses.