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missing page info first pub 2007 (editions)

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

nonfiction history science challenging informative medium-paced

240 pages first pub 2007 (editions)

nonfiction history science challenging informative medium-paced

288 pages first pub 2007 (editions)

nonfiction history science challenging informative medium-paced