Columbia subject headings:
Social change--Congresses.
Social policy--Congresses.
Social sciences--Research--United States--Congresses.
United States--Social policy--Congresses.
Harvard subject headings:
Social change--Congresses
Social policy--Congresses
Social sciences--Research--United States--Congresses.
United States--Social policy--Congresses.
Princeton subject headings:
Social change--Congresses.
Social policy--Congresses.
Social sciences--Research--United States--Congresses.
United States--Social policy--Congresses.