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520 pages hardcover

nonfiction science informative medium-paced
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528 pages hardcover

nonfiction science informative medium-paced

520 pages hardcover

nonfiction science informative medium-paced

520 pages hardcover

nonfiction science informative medium-paced

48 pages hardcover 1994

nonfiction science informative medium-paced

528 pages hardcover 2013

nonfiction science informative medium-paced