Encyclopaedia of medicinal plants of the world: identification, chemistry, properties and applications: v.4: medicinal plants of North and South America/

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• Law of employment /
  gan: Selwyn, Norman M.
  Cyhoeddwyd: (1978)
• Encyclopaedia of medicinal plants of the world: identification, chemistry, properties and applications: v.1: medicinal plants of Asia/
  Cyhoeddwyd: (2013)
• Encyclopaedia of medicinal plants of the world: identification, chemistry, properties and applications: v.5: medicinal plants of Australia/
  Cyhoeddwyd: (2013)
• Encyclopaedia of medicinal plants of the world: identification, chemistry, properties and applications: v.2: medicinal plants of Europe/
  Cyhoeddwyd: (2013)
• Encyclopaedia of medicinal plants of the world: identification, chemistry, properties and applications: v.3: medicinal plants of Africa/
  Cyhoeddwyd: (2013)