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Operation Otherworld is a 4-book series with 3 primary works first released in 1953 with contributions by Poul Anderson.
1971 • 7 Readers • 211 pages • 4
1999 • 2 Readers • 438 pages
1953 • 37 Readers • 232 pages • 3.5
1974 • 10 Readers • 207 pages • 4