Columbia subject headings:
Income distribution--United States--History.
Public welfare--United States--History.
Social security--United States--History.
United States. Social Security Administration--History.
United States. Social Security Board--History.
Harvard subject headings:
Income distribution--United States--History.
Public welfare--United States--History
Social security--United States--History
United States. Social Security Administration--History.
United States. Social Security Board--History.
Princeton subject headings:
Income distribution--United States--History.
Public welfare--United States--History.
Social security--United States--History.
United States. Social Security Administration--History.
United States. Social Security Board--History.