Columbia subject headings:
Frankfurt am Main (Germany)--Social conditions.
Hamburg (Germany)--Social conditions.
Housing--Austria--Vienna--History--20th century.
Housing--Germany--Frankfurt am Main--History--20th century.
Housing--Germany--Hamburg--History--20th century.
Vienna (Austria)--Social conditions.
Harvard subject headings:
Frankfurt am Main (Germany)--Social conditions.
Hamburg (Germany)--Social conditions.
Housing--Austria--Vienna--History--20th century.
Housing--Germany--Frankfurt am Main--History--20th century.
Housing--Germany--Hamburg--History--20th century.
Vienna (Austria)--Social conditions.
Princeton subject headings:
Frankfurt am Main (Germany)--Social conditions.
Hamburg (Germany)--Social conditions.
Housing--Austria--Vienna--History--20th century.
Housing--Germany (West)--Frankfurt am Main--History--20th century.
Housing--Germany (West)--Hamburg--History--20th century.
Vienna (Austria)--Social conditions.