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48 pages first pub 1897 (editions)

nonfiction philosophy science challenging informative reflective slow-paced
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24 pages first pub 1897 (editions)

nonfiction philosophy science challenging informative reflective slow-paced

26 pages first pub 1897 (editions)

nonfiction philosophy science challenging informative reflective slow-paced

30 pages first pub 1897 (editions)

nonfiction philosophy science challenging informative reflective slow-paced