Romano, Deane. Flight from Time One
Divergences: 900 CE, 1940 CE
What if: The Qarmatian Muslims enjoyed further victories after Basra or Great Britain capitulated to the Nazis.
Summary: An astral disarmamament inspector discovers a crosstime Nazi plot to destroy his timeline, Time One.
Published: Walker 1972 (0802755542) and Fitzhenry & Whiteside 1972.