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170 pages first pub 1982 (editions)

nonfiction science informative reflective slow-paced
Other editions (4)
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208 pages first pub 1982 (editions)

nonfiction science informative reflective slow-paced

178 pages missing pub info (editions)

nonfiction science challenging informative reflective medium-paced

168 pages first pub 1982 (editions)

nonfiction science informative reflective slow-paced

235 pages first pub 1982 (editions)

nonfiction science informative reflective slow-paced