Columbia subject headings:
Apartment houses--Germany.
Architecture--Designs and plans.
Working class--Dwellings--Germany.
Harvard subject headings:
Apartment houses--Germany
Architecture--Designs and plans
Labor--Dwellings--Germany.
Working class--Dwellings--Germany.
Princeton subject headings:
Apartment houses--Germany.
Architecture--Designs and plans.
Working class--Dwellings--Germany.