Columbia subject headings:
Architecture--Europe--History--19th century.
Joint occupancy of buildings--Europe.
Working class--Dwellings--Europe.
Harvard subject headings:
Architecture, Modern--19th century--Europe.
Architecture, Modern--20th century--Europe.
Working-men's clubs--Europe--Buildings.
Princeton subject headings:
Architecture, Modern--19th century--Europe.
Architecture, Modern--20th century--Europe.
Community centers--Europe.