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551 pages 1997

nonfiction science informative medium-paced
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768 pages paperback 1997

nonfiction science informative medium-paced

576 pages hardcover 1997

nonfiction science informative medium-paced

616 pages hardcover 1997

nonfiction science informative medium-paced

551 pages paperback 1997

nonfiction science informative medium-paced

720 pages paperback 1997

nonfiction science informative medium-paced

652 pages hardcover 1997

nonfiction science informative medium-paced