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215 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced
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216 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced

262 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced

220 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced

211 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced

224 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced

224 pages first pub 2001 (editions)

nonfiction science challenging informative medium-paced