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212 pages first pub 1988 (editions) user-added

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

nonfiction science challenging informative slow-paced

228 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

missing duration info first pub 1988 (editions)

nonfiction science challenging informative slow-paced

248 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

264 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

228 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

319 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

167 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

6 hours, 26 minutes first pub 1988 (editions) user-added

nonfiction science challenging informative slow-paced

247 pages first pub 1988 (editions) user-added

nonfiction science challenging informative slow-paced