D's for Dimension—the Fourth one we mean;
It's mighty well known, though it's never been seen.
E is for Earthmen who wander through space,
Calmly subduing each troublesome race.
F is for Forrest, most famous of fans;
The letters he's written would fill sev'ral vans.
G is for Gilmore; the first name is Tony.
His writing's okay, but that moniker's phony.
H is for Hamilton, who has written a lot;
He sure makes good use of his favorite plot.
I's for Invaders who seek Earth to hold,
Until they are slain by our hero so bold.
J is for Jupiter and each Jovian moon;
To fantasy writers they sure are a boon.
K is for Keller, who lives in Penn State;
He can't get a cover though his stories are great.
L is for Luna, our own satellite;
It's appeared in more yarns than I'm able to cite.
M is for Mars, way up in the sky,
Without it, we fear, science fiction would die.