Columbia subject headings:
Authors, American--20th century--Biography.
Science fiction, American--Bio-bibliography.
Science fiction, American--History and criticism.
Harvard subject headings:
Authors, American--20th century--Biography
Authors, American--20th century--Biography--Dictionaries
Reference works.
Science fiction, American--Bio-bibliography--Dictionaries.
Science fiction, American--Bio-bibliography.
Science fiction, American--Dictionaries.
Science fiction, American--History and criticism.
Princeton subject headings:
Authors, American--20th century--Biography.
Science fiction, American--Bio-bibliography.
Science fiction, American--History and criticism.