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missing duration info first pub 1989 (editions)

nonfiction middle grade science challenging fast-paced
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128 pages first pub 1989 (editions)

nonfiction middle grade science challenging fast-paced

142 pages first pub 1989 (editions)

nonfiction middle grade science challenging fast-paced

missing page info first pub 1989 (editions)

nonfiction middle grade science challenging fast-paced

128 pages first pub 1989 (editions)

nonfiction childrens science challenging informative lighthearted slow-paced

128 pages first pub 1989 (editions)

nonfiction middle grade science challenging fast-paced