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346 pages 1990

nonfiction science challenging informative slow-paced
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602 pages paperback 1990

nonfiction science challenging informative slow-paced

586 pages paperback 1990

nonfiction science challenging informative slow-paced

540 pages paperback 1990

nonfiction science challenging informative slow-paced

586 pages hardcover 1990

nonfiction science challenging informative slow-paced

272 pages paperback 1990

nonfiction science challenging informative slow-paced