KEY TO CATEGORIES
P = Prototypes/Precursors
A = Paradigms
B = U.S. Futuristic Stories and
Adventure Stories (1800-1926)
C = British Futuristic and Adventure
Stories (1800-80s)
D = British Scientific Romance
(1880s-1950)
E = U.S. Genre (1926- )
F = U.S. Mainstream (1926-
)
G = British (including Commonwealth)
Genre (1945- )
H = British (including Commonwealth)
Mainstream (1945 - )