Vipera berus/External Links
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- Vipera berus at Amphibians and Reptiles of Europe. Accessed on 16 August 2006.
- Adder (Vipera berus) at ARKive. Accessed 9 October 2006.
- Adder or Viper - Vipera berus at Reptiles and Amphibians of the UK. Accessed 9 October 2006.
- Vipera berus at Club100. Accessed 9 October 2006.
- Viper berus - Adder at First Nature. Accessed 9 October 2006.
- Adder (Vipera berus) at Warwickshire Amphibian and Reptile Team. Accessed 9 October 2006.
- Vipera Berus bite at Swedish Orphan International. Accessed 9 October 2006.
- Adder, Vipera berus at Reptiles & Amphibians of France. Accessed 30 October 2006.