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3 hours, 11 minutes first pub 2014 (editions)

nonfiction science challenging informative slow-paced
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119 pages first pub 2014 (editions)

nonfiction science challenging informative slow-paced

120 pages first pub 2014 (editions)

nonfiction science challenging informative slow-paced

133 pages first pub 2014 (editions)

nonfiction science challenging informative slow-paced