Columbia subject headings:
Harvard subject headings:
Coal miners' spouses--Legal status, laws, etc.--United States.
Coal miners--Legal status, laws, etc.--United States
Lungs--Dust diseases--United States.
Survivors' benefits--Law and legislation--United States.
Workers' compensation--Law and legislation--United States.
Princeton subject headings:
Coal miners' spouses--Legal status, laws, etc.--United States.
Coal miners--Legal status, laws, etc.--United States.
Lungs--Dust diseases--United States.
Survivors' benefits--Law and legislation--United States.
Workers' compensation--Law and legislation--United States.