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193 pages first pub 1988 (editions)

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

nonfiction science challenging informative slow-paced

163 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

276 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

212 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

missing page info first pub 1988 (editions)

nonfiction science challenging informative slow-paced

180 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

7 hours, 18 minutes first pub 1988 (editions) user-added

nonfiction science challenging informative slow-paced

272 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

278 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced

231 pages first pub 1988 (editions)

nonfiction science challenging informative slow-paced