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159 pages first pub 1997 (editions)

nonfiction childrens science informative medium-paced
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160 pages first pub 1997 (editions)

nonfiction childrens science informative medium-paced

173 pages first pub 1997 (editions)

nonfiction childrens science informative medium-paced

160 pages first pub 1997 (editions) user-added

nonfiction childrens science informative medium-paced