Columbia subject headings:
Earth (Planet)--Crust.
Frozen ground--Russia (Federation)--Siberia, Western.
Terrestrial heat flow--Russia (Federation)--Siberia, Western.
Harvard subject headings:
Earth (Planet)--Crust.
Frozen ground--Russia (Federation)--Siberia, Western.
Terrestrial heat flow--Russia (Federation)--Siberia, Western.
Princeton subject headings:
Earth (Planet)--Crust.
Frozen ground--Russia (Federation)--Siberia, Western.
Terrestrial heat flow--Russia (Federation)--Siberia, Western.