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375 pages missing pub info (editions)

nonfiction science informative medium-paced
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352 pages missing pub info (editions)

nonfiction science informative medium-paced

302 pages first pub 1997 (editions)

nonfiction science challenging informative reflective medium-paced

321 pages missing pub info (editions)

nonfiction science informative medium-paced

336 pages first pub 1997 (editions) user-added

nonfiction science informative medium-paced