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5 hours, 11 minutes first pub 1994 (editions) user-added

nonfiction science challenging informative reflective slow-paced
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224 pages first pub 1994 (editions)

nonfiction science informative reflective fast-paced

192 pages first pub 1994 (editions) user-added

nonfiction science challenging informative reflective slow-paced

208 pages first pub 1994 (editions)

nonfiction science informative reflective fast-paced