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- W. J. Wouter, Botzen 1
- W.J Wouter, Botzen 2
- Waite, T D 1
- Walker, Prof Jeffrey 1
- Wang, Lirong 2
- Ward, Bob 1
- Ward, Nicola 1
- Warner, Jeroen 1
- Warner, Koko 1
- Warren, Sarah 1
- Washington state Department for Health, Environment Public Health Office of Drinking Water 1
- Watanabe, Max 1
- Water Aid 1
- Water International 1
- Watkins, Simon 1
- Watts, Jesse 2
- Webb, Bret 1
- Weber, Anna 1
- Weesakul, Sutat 1
- Wehner, Martin 1