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6 hours, 55 minutes first pub 2012 (editions)

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

nonfiction science challenging informative slow-paced

256 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

258 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

304 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

207 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

242 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

288 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

248 pages first pub 2012 (editions)

nonfiction science challenging informative slow-paced

232 pages first pub 2012 (editions) user-added

nonfiction science challenging informative slow-paced