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Series
5 books in the catalogue

Book 1
In the Balance
Harry Turtledove

Book 2
Tilting the Balance (Worldwar Series, Volume 2)
Harry Turtledove, Todd McLaren

Book 3
Upsetting the Balance (Worldwar Series, Volume 3)
Harry Turtledove

Book 4
Striking the Balance (Worldwar Series, Volume 4)
Harry Turtledove

Homeward bound
Harry Turtledove
Book data and covers from Open Library (openlibrary.org).