Columbia subject headings:
American drama--20th century--Bio-bibliography.
American drama--20th century--History and criticism.
Dramatists, American--20th century--Biography--Dictionaries.
Harvard subject headings:
American drama--20th century--Bio-bibliography--Dictionaries.
American drama--20th century--Bio-bibliography.
American drama--20th century--Dictionaries.
American drama--20th century--History and criticism
Dramatists, American--20th century--Biography
Dramatists, American--20th century--Biography--Dictionaries.
Princeton subject headings:
American drama--20th century--Bio-bibliography.
American drama--20th century--History and criticism.
Dramatists, American--20th century--Biography.