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474 pages paperback 1997

nonfiction history science challenging informative medium-paced
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552 pages paperback 1997

nonfiction history science challenging informative medium-paced

512 pages 1997

nonfiction history science challenging informative medium-paced

528 pages 1997

nonfiction history science challenging informative medium-paced

475 pages paperback 1997

nonfiction history science challenging informative medium-paced