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  • Gymnosperm Database (2006) Information on Pinus hwangshanensis [link] (accessed 2008-08-05)
  • Gymnosperm Database (2007a) Information on Halocarpus kirkii [link] (accessed 2008-07-20)
  • Gymnosperm Database (2007b) Information on Juniperus foetidissima [link] (accessed 2008-07-25)
  • Gymnosperm Database (2007c) Information on Pinus johannis [link] (accessed 2008-08-05)
  • Gymnosperm Database (2007d) Information on Pinus maximartinezii [link] (accessed 2008-08-05)
  • Gymnosperm Database (2007e) Information on Pinus orizabensis [link] (accessed 2008-08-05)
  • Gymnosperm Database (2007f) Information on Pinus pinceana [link] (accessed 2008-08-05)
  • Gymnosperm Database (2008) Information on Pinus torreyana [link] (accessed 2008-08-05)