1999 - Alien Secrets (Hardcover) → Paperback, Hardcover, Audio Cassette ISBN-13: 9780329133382 ISBN-10: 0329133381 Genre: Teen & Young Adult ? 1999 - Alien Secrets (Paperback) → Paperback, Hardcover, Audio Cassette ISBN-13: 9780440228516 ISBN-10: 0440228514 Genres: Children's Books, Science Fiction & Fantasy, Teen & Young Adult 13 1994 - Alien Secrets (Paperback) → Paperback, Hardcover, Audio Cassette ISBN-13: 9780440410614 ISBN-10: 0440410614 Genres: Children's Books, Science Fiction & Fantasy, Teen & Young Adult 5 |