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280 pages first pub 1969 (editions) user-added

nonfiction history science challenging informative slow-paced
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256 pages first pub 1969 (editions)

nonfiction history science challenging informative slow-paced

319 pages first pub 1969 (editions)

nonfiction history science challenging informative slow-paced

256 pages first pub 1969 (editions)

nonfiction history science challenging informative slow-paced

319 pages first pub 1969 (editions)

nonfiction history science challenging informative slow-paced