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352 pages paperback

nonfiction science informative medium-paced
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375 pages paperback

nonfiction science informative medium-paced

302 pages paperback 1997

nonfiction science challenging informative reflective medium-paced

321 pages hardcover

nonfiction science informative medium-paced

336 pages hardcover 1997 user-added

nonfiction science informative medium-paced