I read that part of the Wiki file. Did he write anything Sci Fi that wasn’t alternate history?
Hm...that does narrow it down quite a bit. I liked "Household Gods" in which a modern lawyer finds herself in the Roman Empire of Marcus Aurelius. Turtledove has a PhD in Byzantine history, and it shows.
While "A World of Difference" is technically alternate history, it doesn't feel like it. In this story, the 4th planet of our solar system is larger and named Minerva instead of Mars. Earth history is otherwise identical until 1976, when the Viking space probe sends back one picture — that of an alien creature swinging a stick — before losing contact. A USA mission and a USSR mission are sent to explore the planet; these two missions start separately but later have to cooperate. I've also read this one, and can recommend it.
Beyond that, all I can think of is his Hellenic Traders series, historical fiction about two cousins who are traveling merchants in the 4th century BC Mediterranean. Please note that this series was written under the pen name H.N. Turteltaub. I haven't read this one, but I might just do that after I finish the series I'm currently reading (The Belgariad & The Mallorean by Eddings).