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16 hours, 12 minutes first pub 1976 (editions)

nonfiction science challenging informative reflective slow-paced
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493 pages first pub 1976 (editions)

nonfiction science challenging informative reflective slow-paced

493 pages first pub 1976 (editions)

nonfiction science challenging informative reflective slow-paced

408 pages first pub 1976 (editions)

nonfiction science challenging informative reflective slow-paced

496 pages first pub 1976 (editions)

nonfiction science challenging informative reflective slow-paced