LINK
Agenzie
- APAT - Agenzia per la protezione dell'ambiente e per i servizi tecnici (I)
- Natural England (UK)
- Countryside Access (UK)
- Countryside Council for Wales (UK)
- Scottish Naturale Heritage (UK)
- Conception Paysage Suisse(CH)
- Defra. Department for Environment, Food and Rural Affairs. Wildlife and Countryside (UK)
- U.S. Environmental Protectione Agency (USA)