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