Columbia subject headings:
Architecture--Austria--Vienna.
City planning--Austria--Vienna.
Ehn, Karl, 1888-1957.
Harvard subject headings:
Apartment houses--Austria--Vienna.
Architecture, Modern--20th century--Austria.
Dwellings--Austria--Vienna.
Ehn, Karl, 1888-1957.
Heilgenstadt (Vienna, Austria)--Buildings, structures, etc.
Karl-Marx-Hof (Heiligenstadt, Vienna, Austria).
Princeton subject headings:
Architecture--Austria--Vienna.
City planning--Austria--Vienna.
Ehn, Karl, 1888-1957.