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160 pages first pub 2005 (editions)

nonfiction science challenging informative slow-paced
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131 pages first pub 2005 (editions)

nonfiction science challenging informative slow-paced

167 pages first pub 2005 (editions)

nonfiction science challenging informative slow-paced

3 hours, 45 minutes first pub 2005 (editions) user-added

nonfiction science challenging informative slow-paced