Columbia subject headings:
Harvard subject headings:
Geology, Stratigraphic--Paleozoic
Paleontology--Paleozoic
Paleontology--Russia (Federation)--Siberia
Paleontology--Russia (Federation)--Ural Mountains Region
Paleontology--Ural Mountains Region.
Princeton subject headings:
Paleontology--Paleozoic.
Paleontology--Russia (Federation)--Siberia.
Paleontology--Russia (Federation)--Ural Mountains Region.