THE PORTAL OF TIME: Sci-Fi Time Travel Collection: The Time Machine, Flight from Tomorrow, Anthem, Key Out of Time, The Time Traders, Pursuit, A Traveler ... The Variable Man, The Skull, The Big Time…

By Andre Norton, August Derleth, Ayn Rand, Frederik Pohl, Fritz Leiber, H. Beam Piper, H. G. Wells, Lester Del Rey, Mark Twain and Philip K. Dick