Columbia subject headings:
American drama--20th century--Bibliography.
Theater--United States--Dictionaries.
Theater--United States--Reviews.
Harvard subject headings:
American drama--20th century--Bibliography.
Reference works.
Theater--United States--Dictionaries.
Theater--United States--Reviews.
Princeton subject headings:
American drama--20th century--Bibliography.
Theater--United States--Dictionaries.
Theater--United States--Reviews.