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530 pages first pub 1988 (editions) user-added

nonfiction science informative medium-paced
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528 pages first pub 1988 (editions)

nonfiction science informative medium-paced

556 pages first pub 1988 (editions)

nonfiction science informative medium-paced

560 pages first pub 1988 (editions)

nonfiction science informative medium-paced

608 pages first pub 1988 (editions)

nonfiction science informative medium-paced