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408 pages paperback 1993

nonfiction science challenging informative slow-paced
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628 pages hardcover 1993

nonfiction science challenging informative slow-paced

628 pages 1993

nonfiction science challenging informative slow-paced

408 pages hardcover 1993

nonfiction science challenging informative slow-paced

628 pages paperback 1993

nonfiction science challenging informative slow-paced