Columbia subject headings:
Mineral industries--Periodicals.
Mineral industries--United States--Periodicals.
Mines and mineral resources--Periodicals.
Mines and mineral resources--United States--Periodicals.
Harvard subject headings:
Mineral industries--Periodicals
Mineral industries--United States--Periodicals
Mines and mineral resources--Periodicals
Mines and mineral resources--United States--Periodicals.
Princeton subject headings:
Mineral industries--United States--Periodicals.
Mines and mineral resources--United States--Periodicals.
Periodicals.