The Serapis Classics edition of The Science Fiction Omnibus #1!
A smashing, kick-butt collection of some of the best sci-fi ever written:

GENESIS, by H. Beam Piper
FARMER, by Mack Reynolds
EARTHSMITH, by Milton Lesser
WHERE THE WORLD IS QUIET, by C.H. Liddell
WARNING FROM THE STARS, by Ron Cocking
THY NAME IS WOMAN, by Kenneth O'Hara
THE SWORD, by Frank Quattrocchi
THE YILLIAN WAY, by Keith Laumer
OPERATION EARTHWORM, by Joe Archibald
THE LAST LETTER, by Fritz Leiber T
HE BACK OF OUR HEADS, by Stephen Barr
FLIGHT THROUGH TOMORROW, by Stanton Coblentz
THE DWINDLING YEARS, by Lester Del Rey
THE MARCHING MORONS, by C.M. Kornbluth
THE VENUS TRAP, by Evelyn E. Smith
MY LADY GREENSLEEVES, by Frederik Pohl
McILVAINE'S STAR, by August Derleth
THE RAG AND BONE MEN, by Algis Budrys
NIGHTMARE PLANET, by Murray Leinster
KEEP OUT, by Frederic Brown
NO GREAT MAGIC, by Fritz Leiber
THE DESTROYERS, by Randall Garrett