Columbia subject headings:
Harvard subject headings:
African Americans--Congresses
African Americans--Economic conditions--Congresses.
African Americans--Education--Congresses.
African Americans--Suffrage--Congresses.
United States--Race relations--Congresses.
Princeton subject headings:
African Americans--Economic conditions--Congresses.
African Americans--Education--Congresses.
African Americans--Politics and government--Congresses.
United States--Race relations--Congresses.