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520 pages first pub 1981 (editions)

nonfiction science challenging informative medium-paced
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missing page info first pub 1981 (editions)

nonfiction science challenging informative medium-paced

528 pages first pub 1981 (editions)

nonfiction nature science challenging informative medium-paced

420 pages first pub 1981 (editions)

nonfiction science challenging informative medium-paced

389 pages first pub 1981 (editions)

nonfiction science challenging informative medium-paced