Columbia subject headings:
Civil service--Pensions--United States.
Disability insurance--Law and legislation--United States.
Lungs--Dust diseases--Law and legislation--United States.
Military pensions--Law and legislation--United States.
Social security--Law and legislation--United States.
Harvard subject headings:
Civil service--United States--Pensions.
Disability insurance--Law and legislation--United States.
Lungs--Dust diseases--Law and legislation--United States.
Military pensions--Law and legislation--United States.
Social security--Law and legislation--United States
Princeton subject headings: