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495 pages first pub 2007 (editions)

nonfiction history science challenging informative medium-paced
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400 pages first pub 2007 (editions)

nonfiction history science challenging informative medium-paced

496 pages first pub 2007 (editions)

nonfiction history science challenging informative medium-paced

495 pages first pub 2007 (editions)

nonfiction history science challenging informative medium-paced