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249 pages first pub 1957 (editions)

fiction science fiction young adult adventurous challenging slow-paced
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235 pages first pub 1957 (editions) user-added

fiction science fiction young adult adventurous challenging slow-paced

missing page info first pub 1957 (editions)

fiction science fiction young adult adventurous challenging slow-paced

157 pages first pub 1957 (editions)

fiction science fiction young adult adventurous challenging slow-paced

384 pages first pub 1957 (editions)

fiction science fiction young adult adventurous challenging slow-paced