H. Beam Piper & Fritz Leiber 
The Science Fiction Omnibus #1 [EPUB ebook] 

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 THE 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 Mc ILVAINE’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