Columbia subject headings:
Building, Iron and steel--Illinois--Chicago.
Chicago (Ill.)--Buildings, structures, etc.
Chicago Federal Center (Chicago, Ill.)
Mies van der Rohe, Ludwig, 1886-1969--Criticism and interpretation.
Public buildings--Illinois--Chicago.
Harvard subject headings:
Architects--Germany
Chicago (Ill.)--Buildings, structures, etc.
Mies van der Rohe, Ludwig, 1886-1969--Criticism and interpretation.
Post office stations and branches--Illinois--Chicago.
Public architecture--Illinois--Chicago.
Princeton subject headings:
Architecture--Illinois--Chicago--20th century.
Chicago (Ill.)--Buildings, structures, etc.
Mies van der Rohe, Ludwig, 1886-1969.
Skyscrapers--Illinois--Chicago.