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  • Thumbnail for Paul R. Ehrlich
    (July 1994). "Optimum Human Population Size". Population and Environment: A Journal of Interdisciplinary Studies. 15 (6). Human Sciences Press: 469–475. Bibcode:1994PopEn...
    55 KB (5,988 words) - 09:25, 19 November 2024
  • David (1995). "Energy and Human Evolution". Population and Environment: A Journal of Interdisciplinary Studies. 16 (4): 301–319. Bibcode:1995PopEn..16..301P...
    90 KB (9,919 words) - 13:33, 24 October 2024