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224 pages first pub 1989 (editions)

nonfiction nature science informative medium-paced
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161 pages first pub 1989 (editions)

nonfiction nature science informative medium-paced

216 pages first pub 1989 (editions)

nonfiction nature science informative medium-paced

161 pages first pub 1989 (editions)

nonfiction nature science informative medium-paced

151 pages first pub 1989 (editions) user-added

nonfiction nature science informative medium-paced