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64 pages first pub 2000 (editions)

nonfiction mathematics science challenging informative medium-paced
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64 pages first pub 2000 (editions)

nonfiction mathematics science challenging informative medium-paced

64 pages first pub 2000 (editions)

nonfiction mathematics science challenging informative medium-paced

64 pages missing pub info (editions)

nonfiction science adventurous informative lighthearted slow-paced

64 pages first pub 2000 (editions)

nonfiction mathematics science challenging informative medium-paced

66 pages first pub 2000 (editions)

nonfiction mathematics science adventurous informative lighthearted slow-paced

64 pages first pub 2000 (editions)

nonfiction mathematics science adventurous informative lighthearted slow-paced