Columbia subject headings:
Geochemistry--Congresses.
Metal sulfides--Congresses.
Orogeny--Congresses.
Sedimentary rocks--Congresses.
Sulfide minerals--Congresses.
Volcanic ash, tuff, etc.--Congresses.
Harvard subject headings:
Igneous rocks--Congresses
Igneous rocks--Congresses.
Ore deposits--Congresses
Sedimentary rocks--Congresses
Sedimentary rocks--Congresses.
Sulfides--Congresses.
Princeton subject headings:
Geochemistry--Congresses.
Metal sulfides--Congresses.
Orogeny--Congresses.
Sedimentary rocks--Congresses.
Sulfide minerals--Congresses.
Volcanic ash, tuff, etc.--Congresses.