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438 pages first pub 2008 (editions)

nonfiction science informative medium-paced
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542 pages first pub 2008 (editions)

nonfiction science informative medium-paced

542 pages first pub 2008 (editions)

nonfiction science informative medium-paced

505 pages first pub 2008 (editions) user-added

nonfiction science informative medium-paced