Columbia subject headings:
Ballinger, Margaret, 1894-1980--Archives--Catalogs.
Ballinger, William, 1894-1974--Archives--Catalogs.
South Africa--History--1909-1961--Sources--Bibliography--Catalogs.
South Africa--Race relations--History--Sources--Bibliography--Catalogs.
Harvard subject headings:
Ballinger, Margaret, 1894---Archives--Catalogs.
Ballinger, William, 1894-1974--Archives--Catalogs.
Black people--South Africa--Economic conditions--Sources--Bibliography--Catalogs.
Black people--South Africa--Social conditions--Sources--Bibliography--Catalogs.
South Africa--Politics and government--1948-1961--Sources--Bibliography--Catalogs.
University of the Witwatersrand. Library--Catalogs.
Princeton subject headings: