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7 hours, 56 minutes first pub 1988 (editions)

nonfiction science challenging informative slow-paced
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193 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

247 pages first pub 1988 (editions) user-added

nonfiction science challenging informative slow-paced

233 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced