Columbia subject headings:
Metallurgy--Handbooks, manuals, etc.
Ore-dressing--Handbooks, manuals, etc.
Harvard subject headings:
Metallurgy--Handbooks, manuals, etc.
Ore-dressing--Handbooks, manuals, etc.
Princeton subject headings:
Metallurgy--Handbooks, manuals, etc.
Ore-dressing--Handbooks, manuals, etc.