Columbia subject headings:
Coal mines and mining--Law and legislation--United States--Congresses.
Mining law--United States--Congresses.
Petroleum law and legislation--United States--Contresses.
Harvard subject headings:
Coal mines and mining--Law and legislation--United States--Congresses.
Mining law--United States--Congresses.
Petroleum law and legislation--United States--Congresses.
Princeton subject headings: