Columbia subject headings:
American fiction--20th century--History and criticism.
Science fiction--History and criticism.
Harvard subject headings:
American fiction--20th century--History and criticism
Blish, James.
Bradbury, Ray, 1920-2012--Criticism and interpretation.
Heinlein, Robert A. (Robert Anson), 1907---Criticism and interpretation.
Heinlein, Robert A. (Robert Anson), 1907-1988--Criticism and interpretation.
Moskowitz, Sam
Pratt, Fletcher, 1897-1956
Science fiction--History and criticism
Princeton subject headings:
American fiction--20th century--History and criticism.
Science fiction--History and criticism.