Columbia subject headings:
Seismology--Periodicals.
Seismology--Soviet Union--Periodicals.
Volcanoes--Periodicals.
Volcanoes--Soviet Union--Periodicals.
Harvard subject headings:
Seismology--Periodicals.
Seismology--Soviet Union--Periodicals.
Volcanoes--Periodicals.
Volcanoes--Soviet Union--Periodicals.
Volcanology--Periodicals.
Volcanology--Soviet Union--Periodicals.
Princeton subject headings:
Periodicals.
Seismology--Soviet Union--Periodicals.
Volcanoes--Soviet Union--Periodicals.