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341 pages first pub 2012 (editions)

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

nonfiction science informative slow-paced

320 pages first pub 2012 (editions)

nonfiction science informative slow-paced

303 pages first pub 2012 (editions) user-added

nonfiction science informative slow-paced