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277 pages first pub 2012 (editions)

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

nonfiction science challenging informative medium-paced

304 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

259 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

300 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

249 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

247 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

272 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

300 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced