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Conservatoire botanique national des Pyrénées et de Midi-Pyrénées

Ministère britannique de l’environnement, Department of Environment (DoENI) Northern Ireland, Joint Nature Conservation Committee (JNCC), National Association of Wholesaler-Distributors (NAW), Plantlife, 2004 . Plant diversity challenge : the UK's response to the global strategy for plant conservation. Joint Nature Conservation Committee, Peterborough, UK. 53 pp.