Columbia subject headings:
Harvard subject headings:
Coasts--Baltic Sea Region.
Geology, Stratigraphic--Carboniferous
Geology, Stratigraphic--Devonian
Geology--Baltic Sea Region
Paleontology--Carboniferous
Paleontology--Devonian
Princeton subject headings:
Geology, Stratigraphic--Carboniferous.
Geology, Stratigraphic--Devonian.
Geology--Baltic states.
Paleontology--Baltic states.
Paleontology--Carboniferous.
Paleontology--Devonian.