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62 pages first pub 1989 (editions)

nonfiction childrens science adventurous informative lighthearted medium-paced
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63 pages first pub 1985 (editions)

nonfiction childrens science adventurous informative lighthearted medium-paced

63 pages first pub 1985 (editions)

nonfiction childrens science adventurous informative lighthearted medium-paced