Columbia subject headings:
Architecture--Illinois--Chicago--History--20th century.
Architecture--Illinois--Chicago--History.
Harvard subject headings:
Architecture, Modern--20th century--Illinois--Chicago.
Architecture--Illinois--Chicago--History.
Architecture--Illinois--History--20th century--Illinois--Chicago.
Architecture--Illinois--Illinois--Chicago--History.
Chicago (Ill.)--Buildings, structures, etc.--History.
Princeton subject headings:
Architecture--Illinois--Chicago.
Central business districts--Illinois--Chicago.
Chicago (Ill.)--Buildings, structures, etc.
Loop (Chicago, Ill.)--Buildings, structures, etc.
Mies van der Rohe, Ludwig, 1886-1969.