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missing duration info first pub 2012 (editions)

nonfiction science challenging informative medium-paced
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190 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

190 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

missing duration info first pub 2012 (editions)

nonfiction science challenging informative medium-paced