Columbia subject headings:
Architectural drawing--United States--20th century.
Holl, Steven.
Watercolor painting, American--20th century.
Harvard subject headings:
Architectural drawing--United States--20th century.
Holl, Steven--Notebooks, sketchbooks, etc.
Watercolor painting, American--20th century.
Princeton subject headings:
Architectural drawing--United States--20th century.
Holl, Steven.
Watercolor painting, American--20th century.