The Ultimate Science Fiction Collection ( 50 Books ), Volume1

American science fiction author and editor Lester del Rey wrote, "Even the devoted aficionado or fan-has a hard time trying to explain what science fiction is," and the lack of a "full satisfactory definition" is because "there are no easily delineated limits to science fiction."
According to Isaac Asimov, "Science fiction can be defined as that branch of literature which deals with the reaction of human beings to changes in science and technology."
Robert A. Heinlein wrote that "A handy short definition of almost all science fiction might read: realistic speculation about possible future events, based solidly on adequate knowledge of the real world, past and present, and on a thorough understanding of the nature and significance of the scientific method."
Contents:
Ray Bradbury

A Little Journey
Zero Hour
Morgue Ship
Lazarus Come Forth
Jonah of the Jove-Run
Defense Mech
Rocket Summer
The Monster Maker
Asleep in Armageddon

Isaac Asimov

Youth
Let's Get Together

Clifford D. Simak

Hellhounds of the Cosmos
Message From Mars
The Street That Wasn't There

Wilbur S. Peacock

The Victory of Klon
Destination – Death
Planet of No-Return

Philip K. Dick

The Eyes Have It
Beyond the Door
Beyond Lies the Wub
Of Withered Apples
The Crawlers
Survey Team
Souvenir
Human Is
Meddler
Tony and the Beetles
The Gun
The Hanging Stranger
Adjustment Team
The Defenders

Fredric Brown

Hall of Mirrors
Two Timer
Keep Out

Kurt Vonnegut

2BR02B

E.M. Forster

The Machine Stops

Robert Louis Stevenson

The Strange Case of Dr. Jekyll and Mr. Hyde

Arthur Machen

The Great God Pan

H. G. Wells

The Island of Doctor Moreau
The Invisible Man
The Time Machine
The War of the Worlds

Stanley G. Weinbaum

Flight on Titan
The Lotus Eaters
A Martian Odyssey

Poul Anderson

SENTIMENT, INC

John W. Campbell

The last evolution
Atomic power

Jerry Sohl

The Elroom
Brknk's Bounty
The Ultroom Error