Columbia subject headings:
Geology, Stratigraphic--Mesozoic.
Natural gas--Geology--Russia (Federation)--Siberia.
Petroleum--Geology--Russia (Federation)--Siberia.
Harvard subject headings:
Princeton subject headings:
Geology, Stratigraphic.
Geology, Structural.
Oil fields--Russia (Federation)--Siberia.
Petroleum--Geology--Soviet Union.