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Conservatoire botanique national des Pyrénées et de Midi-Pyrénées

McLewin, W., 1999 . Fundamental taxonomic problems in and arising from the genus Helleborus. In: Taxonomy of cultivated plants : third international symposium. Royal Botanic Garden, Kew: 297-304.

Gardner, M., 1999 . Managing ex situ conifer conservation collections. In: Taxonomy of cultivated plants : third international symposium. Royal Botanic Garden, Kew: 19-23.

Lewis, P.E., 1999 . The establishment of a national collection of Campanula. In: Taxonomy of cultivated plants : third international symposium. Royal Botanic Garden, Kew: 35-38.

Davies, B.J., 1999 . The national collections of Nymphaea - UK and France. In: Taxonomy of cultivated plants : third international symposium. Royal Botanic Garden, Kew.