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missing duration info first pub 2013 (editions)

nonfiction history science challenging informative slow-paced
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272 pages first pub 2013 (editions)

nonfiction history science challenging informative slow-paced

272 pages first pub 2013 (editions)

nonfiction history science challenging informative slow-paced

272 pages first pub 2013 (editions)

nonfiction history science challenging informative slow-paced