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244 pages first pub 1991 (editions)

nonfiction science challenging informative slow-paced
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336 pages first pub 1991 (editions)

nonfiction science challenging informative slow-paced

336 pages first pub 1991 (editions)

nonfiction science challenging informative slow-paced

296 pages first pub 1991 (editions)

nonfiction science challenging informative slow-paced

244 pages first pub 1991 (editions)

nonfiction science challenging informative slow-paced

319 pages first pub 1991 (editions)

nonfiction science challenging informative slow-paced