Columbia subject headings:
American drama--20th century--Bibliography.
American drama--20th century--History and criticism--Bibliography.
Dramatists, American--20th century--Biography--Indexes.
Theater--United States--History--20th century--Bibliography.
Harvard subject headings:
American drama--20th century--Bibliography.
American drama--20th century--History and criticism--Bibliography.
Dramatists, American--20th century--Biography--Indexes.
Theater--United States--History--20th century--Bibliography.
Princeton subject headings:
American drama--20th century--Bibliography.
American drama--20th century--History and criticism--Bibliography.
Dramatists, American--20th century--Biography--Indexes.
Theater--United States--History--20th century--Bibliography.