Columbia subject headings:
American fiction--20th century--History and criticism.
Detective and mystery stories, American--History and criticism.
Western stories--History and criticism.
Harvard subject headings:
Detective and mystery stories, American--History and criticism.
Western stories--History and criticism.
Princeton subject headings:
American fiction--20th century--History and criticism.
Detective and mystery stories, American--History and criticism.
Western stories--History and criticism.