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408 pages • 2007

nonfiction science informative slow-paced
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408 pages • 2007

nonfiction science informative slow-paced

456 pages • 2007

nonfiction science informative slow-paced

429 pages • 2007

nonfiction science challenging informative reflective slow-paced

missing duration info • 2007

nonfiction science informative slow-paced