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missing page info first pub 1990 (editions)

nonfiction science challenging informative medium-paced
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1504 pages first pub 1990 (editions)

nonfiction science challenging informative medium-paced

1648 pages first pub 1990 (editions)

nonfiction science challenging informative medium-paced

1108 pages first pub 1990 (editions)

nonfiction science challenging informative medium-paced