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616 pages first pub 1993 (editions)

nonfiction science challenging informative medium-paced
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640 pages first pub 1993 (editions)

nonfiction science challenging informative medium-paced

616 pages first pub 1993 (editions)

nonfiction science challenging informative medium-paced

640 pages first pub 1993 (editions)

nonfiction science challenging informative medium-paced

736 pages first pub 1993 (editions)

nonfiction science challenging informative medium-paced