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240 pages 2013

nonfiction mathematics science informative medium-paced
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225 pages hardcover 2013

nonfiction mathematics science informative medium-paced

225 pages paperback 2013

nonfiction mathematics science informative medium-paced

235 pages 2013

nonfiction mathematics science informative medium-paced

225 pages paperback 2013

nonfiction mathematics science adventurous informative slow-paced