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8 hours, 59 minutes audio 2008

nonfiction science informative slow-paced
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298 pages paperback 2008

nonfiction science informative slow-paced

287 pages hardcover 2009

nonfiction science challenging informative reflective slow-paced

304 pages 2008

nonfiction science informative slow-paced

304 pages paperback 2008

nonfiction science informative slow-paced

8 hours, 44 minutes audio 2008 user-added

nonfiction science informative slow-paced

376 pages paperback 2009

nonfiction science informative slow-paced