Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Silurian
Geology, Stratigraphic--Silurian--Czech Republic--Prague Basin (Barrandian)
Geology--Czech Republic--Prague Basin (Barrandian)
Princeton subject headings:
Geology, Stratigraphic--Silurian--Czech Republic--Bohemia.
Geology--Czech Republic--Bohemia.