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256 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced
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169 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

232 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

300 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

181 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

288 pages first pub 1988 (editions) user-added

nonfiction science challenging informative slow-paced

208 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

228 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

167 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

missing page info first pub 1988 (editions)

nonfiction science challenging informative slow-paced

167 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced