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240 pages first pub 1997 (editions)

nonfiction science challenging informative slow-paced
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232 pages first pub 1997 (editions)

nonfiction science challenging informative slow-paced

232 pages first pub 1997 (editions)

nonfiction science challenging informative slow-paced

232 pages first pub 1997 (editions)

nonfiction science challenging informative slow-paced