Columbia subject headings:
Saint Helens, Mount (Wash.)--Eruption, 1980--Congresses.
Harvard subject headings:
Conference papers and proceedings.
Saint Helens, Mount (Wash.)--Congresses.
Saint Helens, Mount (Wash.)--Eruption, 1980--Congresses.
Volcanoes--Congresses.
Volcanoes.
Princeton subject headings:
Saint Helens, Mount (Wash.)--Eruption, 1980--Congresses.