There are strange gaps in our records of the past. We find traces of man-like things - but, suddenly, man appears, far too much developed to be the "next step" in a well-linked chain of evolutionary evidence. Perhaps something like the events of this story furnishes the answer to the riddle.
The Science Fiction Omnibus #1
H. Beam Piper, Fritz Leiber, Mack Reynolds, Keith Laumer, Milton Lesser, C. H. Liddell, Ron Cocking, Kenneth O'Hara, Frank Quattrocchi, Joe Archibald, Stephen Barr, Stanton Coblentz, Lester del Rey, C. M. Kornbluth, Evelyn E. Smith, Frederik Pohl, August Derleth, Algis Budrys, Murray Leinster, Frederic Brown
