Columbia subject headings:
Buenos Aires Metropolitan Area (Argentina)--Economic conditions--Congresses.
Buenos Aires Metropolitan Area (Argentina)--Social conditions--Congresses.
Buenos Aires Metropolitan Area (Argentina)--Social policy--Congresses.
Harvard subject headings:
Buenos Aires Metropolitan Area (Argentina)--Social conditions--20th century.
Buenos Aires Metropolitan Area (Argentina)--Social policy.
Princeton subject headings:
Buenos Aires Metropolitan Area (Argentina)--Economic conditions--Congresses.
Buenos Aires Metropolitan Area (Argentina)--Social conditions--Congresses.
Buenos Aires Metropolitan Area (Argentina)--Social policy--Congresses.