Bensen, D.R. And Having Writ…
Divergence: 1908 CE
What if: Four aliens were stranded on Earth in 1908 when they barely avoided an explosive impact at Tunguska and splash-landed near San Francisco.
Summary: To get their ship repaired, they set about accelerating technological development, but President Edison doesn't want to share with Europe.
Published: Bobbs-Merrill 1978 (0672520788BUY); Ace 1979 (044102274XBUY).
Original in: English.
Translation: German by Irene Holicki as Zwischenhalt, Heyne 1984.