Columbia subject headings:
Architecture--Germany--History--20th century--Catalogs.
Hild & Kaltwasser--Catalogs.
Harvard subject headings:
Architects--Germany
Architecture, Modern--20th century--Germany.
Architecture--Germany--History--20th century--Catalogs
Heinrich, Michael.
Hild & Kaltwasser--Catalogs.
Hild, Andreas.
Kaltwasser, Tillmann, 1959-1999.
Princeton subject headings:
Architecture, Modern--20th century--Germany.
Hild & Kaltwasser.