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224 pages first pub 1989 (editions)

nonfiction science adventurous informative reflective slow-paced
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200 pages first pub 1989 (editions)

nonfiction science adventurous informative reflective slow-paced

174 pages first pub 1989 (editions)

nonfiction science adventurous informative reflective slow-paced

210 pages first pub 1989 (editions)

nonfiction science adventurous informative reflective slow-paced