Columbia subject headings:
Employers' liability--Congresses.
Employers' liability--United States.
Maternity insurance--United States.
Mothers' pensions--United States.
Old age pensions--United States.
Social security.
Unemployment insurance--United States.
Harvard subject headings:
Employers' liability--Congresses.
Employers' liability--United States--Congresses.
Health insurance--United States--Congresses
Maternity insurance--United States--Congresses.
Mothers' pensions--Congresses.
Old age pensions--United States--Congresses.
Savings bank life insurance--United States--Congresses.
Unemployment insurance--United States--Congresses.
Princeton subject headings: