Cover art
Berry, Stephen Ames. The Battle for Terra Two. Tor 1986.

Berry, Stephen Ames. Terra Two Sequence
Divergence: 1939 CE
What if: The US never developed the bomb, Nazi Germany did and Hitler was assassinated in July 1944.
Series note: Four-volume series composed of The Biofab War, The Battle for Terra Two, The A.I. War, and The Final Assault. The first volume is, however, not allohistorical.

Berry, Stephen Ames. The Battle for Terra Two
Divergence: 1939 CE
Summary: A war against insectoids shifts from our Earth to another, with a look at fascist Boston.
Series note: Volume two of the Terra Two Sequence.
Published: Tor 1986 (0812531914BUY, 0812531922BUY).

Berry, Stephen Ames. The A.I. War
Series note: Volume three of the Terra Two Sequence.
Published: Tor 1987 (0812531930BUY).

Berry, Stephen Ames. [The] Final Assault
Series note: Volume four of the Terra Two Sequence.
Comments: Title and copyright pages do not agree on exact title.
Published: Tor 1988 (0812531892BUY, 0812531906BUY).