Columbia subject headings:
Mines and mineral resources--Government policy--United States--Indexes--Databases.
Mines and mineral resources--Records--Indexes--Software.
United States. Bureau of Mines--Indexes--Software.
United States. Bureau of Mines--Records and correspondence--Indexes--Databases.
Harvard subject headings:
Princeton subject headings:
Mines and mineral resources--Government policy--United States--Indexes.
United States. Bureau of Mines--Records and correspondence--Indexes.