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414 pages first pub 1980 (editions)

nonfiction science challenging informative medium-paced
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352 pages first pub 1980 (editions)

nonfiction science challenging informative medium-paced

352 pages first pub 1980 (editions)

nonfiction science challenging informative medium-paced

398 pages first pub 1980 (editions)

nonfiction science challenging informative medium-paced