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224 pages first pub 2008 (editions)

nonfiction science challenging informative slow-paced
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208 pages first pub 2008 (editions)

nonfiction science challenging informative slow-paced

208 pages first pub 2008 (editions) user-added

nonfiction science challenging informative slow-paced

224 pages first pub 2008 (editions)

nonfiction science challenging informative slow-paced