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160 pages first pub 2007 (editions)

nonfiction science challenging informative reflective medium-paced
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208 pages first pub 2007 (editions)

nonfiction science challenging informative reflective medium-paced

157 pages first pub 2007 (editions)

nonfiction science challenging informative reflective medium-paced

245 pages first pub 2007 (editions)

nonfiction science challenging informative reflective medium-paced