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624 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced
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557 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

594 pages first pub 2012 (editions) user-added

nonfiction science challenging informative slow-paced

20 hours, 47 minutes first pub 2012 (editions) user-added

nonfiction science challenging informative slow-paced

20 hours, 47 minutes first pub 2012 (editions) user-added

nonfiction science challenging informative slow-paced

521 pages first pub 2012 (editions) user-added

nonfiction science challenging informative slow-paced

624 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced