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30 hours, 29 minutes first pub 2001 (editions)

nonfiction science informative medium-paced
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30 hours, 33 minutes first pub 2001 (editions)

nonfiction science informative medium-paced

981 pages first pub 2001 (editions) user-added

nonfiction science informative medium-paced

missing page info first pub 2001 (editions)

nonfiction science informative medium-paced