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434 pages paperback 1997

nonfiction science challenging informative slow-paced
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338 pages paperback 1997

nonfiction science challenging informative slow-paced

415 pages paperback 1997

nonfiction science challenging informative slow-paced

352 pages 1997

nonfiction science challenging informative slow-paced

352 pages paperback 1997

nonfiction science challenging informative slow-paced

416 pages digital 1997

nonfiction science challenging informative slow-paced