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796 pages first pub 2009 (editions)

nonfiction science informative medium-paced
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719 pages first pub 2009 (editions)

nonfiction science informative medium-paced

936 pages first pub 2009 (editions)

nonfiction science informative medium-paced

804 pages first pub 2009 (editions)

nonfiction science informative medium-paced

830 pages first pub 2009 (editions)

nonfiction science informative medium-paced