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334 pages first pub 1981 (editions)

nonfiction reference science challenging informative medium-paced
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248 pages first pub 1981 (editions)

nonfiction reference science challenging informative medium-paced

430 pages first pub 1981 (editions)

nonfiction reference science challenging informative medium-paced

421 pages first pub 1981 (editions)

nonfiction reference science challenging informative medium-paced