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  1.  23
    On the road to the Origin with Darwin, Hooker, and Gray.Duncan M. Porter - 1993 - Journal of the History of Biology 26 (1):1-38.
  2. The Correspondence of Charles Darwin, Volume 8, 1860.Frederick Burkhardt, Duncan M. Porter, Janet Browne, Marsha Richmond & Michael T. Ghiselin - 1994 - History and Philosophy of the Life Sciences 16 (2):355.
     
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  3. Hooker, and Gray.Duncan M. Porter - 1993 - Journal of the History of Biology 26 (1):1-38.
     
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  4. The Correspondence of Charles Darwin. Vol. 9: 1861.Frederick Burkhardt, Duncan M. Porter, Joy Harvey, Marsha Richmond & Peter J. Bowler - 1995 - History and Philosophy of the Life Sciences 17 (1):173.
     
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  5.  8
    Men among the mammoths. Victorian science and the discovery of human prehistory.Duncan M. Porter - 1995 - History of European Ideas 21 (4):594-595.