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Current edition

208 pages 1982

nonfiction science informative reflective slow-paced
Other editions (4)
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178 pages paperback

nonfiction science challenging informative reflective medium-paced

170 pages hardcover 1982

nonfiction science informative reflective slow-paced

168 pages paperback 1982

nonfiction science informative reflective slow-paced

235 pages paperback 1982

nonfiction science informative reflective slow-paced