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Having learned that someone has discovered proof of alien life and hidden the proof on the top-secret base called Zone 91, Cassie and the Animorphs struggle to keep the evil Yeerks away from the place.

Editions · 5

Paperback
1998 · Scholastic Inc.
166 pp · EN
9780590494236
Paperback
1998 · Scholastic
166 pp · EN
9780590665414
Paperback
1998 · Scholastic Paperbacks
176 pp · EN
9780590494236
Paperback
1999 · Tandem Library
EN
9780613044998
Paperback
2017 · Scholastic, Incorporated
EN
9781338216554

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