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247 pages first pub 2006 (editions)

nonfiction history science informative medium-paced
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256 pages first pub 2006 (editions)

nonfiction history science informative medium-paced

256 pages first pub 2006 (editions)

nonfiction history science informative medium-paced

256 pages first pub 2006 (editions)

nonfiction history science informative medium-paced