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  1. By: Clark, John R. (John Robert) - Summers, Tony M
    Type: Article
    In: Madroño; a West American journal of botany
    Volume: 60
    Date: 2013
    Page Range: 258--259
    Publication Info: Berkeley, California Botanical Society,
  2. By: Clark, John R. (John Robert)
    Type: Article
    In: Field Museum of Natural History bulletin
    Volume: 43
    Issue: 5
    Date: 1972
    Page Range: 9--9
    Publication Info: [Chicago, Ill.], The Museum, [1972]-©1990
  3. By: Wagner, Warren Lambert - Clark, John R. (John Robert) - Lorence, David
    Type: Article
    In: PhytoKeys
    Volume: 38
    Date: 2014
    Page Range: 37-67
    Publication Info: Pensoft Publishers 2014
  4. By: Clark, John R. (John Robert)
    Type: Article
    In: Bulletin
    Volume: 42
    Issue: 11
    Date: 1971
    Page Range: 12--13
    Publication Info: [Chicago], The Museum, 1966-1972
  5. By: Clark, John R. (John Robert)
    Type: Article
    In: Bulletin
    Volume: 40
    Issue: 7
    Date: 1969
    Page Range: 10--11
    Publication Info: [Chicago], The Museum, 1966-1972