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68 pages first pub 1934 (editions)

nonfiction biography philosophy science challenging informative reflective slow-paced
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56 pages first pub 1934 (editions)

nonfiction biography philosophy science challenging informative reflective slow-paced

3 hours, 30 minutes first pub 2013 (editions) user-added

nonfiction biography philosophy science challenging informative reflective slow-paced

72 pages first pub 1934 (editions)

nonfiction biography philosophy science challenging informative reflective slow-paced