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145 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced
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130 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

130 pages first pub 2012 (editions)

nonfiction science challenging informative medium-paced

215 pages first pub 2012 (editions) user-added

nonfiction science challenging informative medium-paced