When Time Went Mad
by Ralph A. Thomas
Lem Bentwhistle is awakened by what sounds like kids making a crop circle in his cornfield. Instead, he finds someone parked a spaceport on his north forty! While he and the people from the 23rd century try to figure out what has happened, they are soon joined by folks from the 19th century wild west, the crusades, and more. After the raptors arrive, he says they all need to go home NOW. But how?