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366 pages first pub 1969 (editions)

nonfiction philosophy science informative reflective medium-paced
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missing page info first pub 1969 (editions)

nonfiction philosophy science informative reflective medium-paced

missing page info first pub 1969 (editions)

nonfiction philosophy science informative reflective medium-paced

448 pages first pub 1969 (editions)

nonfiction philosophy science informative reflective medium-paced