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missing duration info first pub 1998 (editions)

nonfiction science challenging informative medium-paced
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224 pages first pub 1998 (editions)

nonfiction science informative medium-paced

213 pages first pub 1998 (editions)

nonfiction science informative medium-paced

224 pages first pub 1998 (editions)

nonfiction science informative medium-paced

214 pages first pub 1998 (editions) user-added

nonfiction science informative medium-paced