Columbia subject headings:
Architectural drawing--Germany--20th century--Exhibitions.
Architectural drawing--United States--20th century--Exhibitions.
Jacoby, Helmut--Exhibitions.
Harvard subject headings:
Architectural drawing--Germany.
Architectural drawing--United States.
Jacoby, Helmut
Princeton subject headings:
Architectural drawing--Germany--20th century--Exhibitions.
Architectural drawing--United States--20th century--Exhibitions.
Jacoby, Helmut--Exhibitions.