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257 pages first pub 2015 (editions)

nonfiction science challenging informative inspiring medium-paced
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237 pages first pub 2015 (editions)

nonfiction science challenging informative inspiring medium-paced

237 pages first pub 2015 (editions)

nonfiction science challenging informative inspiring medium-paced

256 pages first pub 2015 (editions)

nonfiction science challenging informative inspiring medium-paced

314 pages first pub 2015 (editions)

nonfiction science challenging informative inspiring medium-paced