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279 pages first pub 2010 (editions)

nonfiction history science informative slow-paced
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1 pages first pub 2009 (editions)

nonfiction history science informative slow-paced

320 pages first pub 2009 (editions)

nonfiction history science informative slow-paced

241 pages first pub 2009 (editions) user-added

nonfiction history science informative slow-paced

320 pages first pub 2009 (editions)

nonfiction history science informative slow-paced

304 pages first pub 2009 (editions)

nonfiction history science informative slow-paced