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676 pages first pub 1912 (editions)

nonfiction history science challenging informative reflective slow-paced
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672 pages first pub 1912 (editions)

nonfiction history science challenging informative reflective slow-paced

638 pages first pub 1912 (editions)

nonfiction history science challenging informative reflective slow-paced

614 pages first pub 1912 (editions)

nonfiction history science challenging informative reflective slow-paced