"Nothing for Nothing"
By Isaac Asimov, Fred Burke, and John Bolton.
*The time is 15,000 B.C., the planet is Earth, but both these concepts are meaningless to the aliens exploring the planet. What is it that makes the ship's explorer insist on a visit to the surface?
"Ginny Sweethips' Flying Circus"
By Neal Barrett, Jr., Leslie Clague, Steve Niles, and Mark Pacella.
*A beautiful woman, her scrawny 'droid, and a six-foot-nine-and-a-quarter-inch possum travel the wasteland peddling sex, tacos and dangerous drugs.
"Fermi and Frost"
By Frederik Pohl and Brent Anderson.
*Radio astronomer Dr. Harry Malibert and an orphan named TImothy survive the atomic holocaust -- but then they must outlast the nuclear winter that follows. *Source: Back Cover.