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160 pages 2012

nonfiction childrens science challenging informative slow-paced
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160 pages hardcover 2012

nonfiction science adventurous informative lighthearted medium-paced

160 pages hardcover 2012

nonfiction childrens science challenging informative slow-paced

160 pages paperback 2012

nonfiction childrens science challenging informative slow-paced

160 pages paperback 2012

nonfiction childrens science challenging informative slow-paced