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204 pages first pub 1965 (editions)

nonfiction science challenging informative medium-paced
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272 pages first pub 1965 (editions)

nonfiction science challenging informative medium-paced

222 pages first pub 1965 (editions)

nonfiction science challenging informative medium-paced

222 pages first pub 1965 (editions) user-added

nonfiction science challenging informative medium-paced