Water quality technology conference and exposition 2009 : Seattle, Washington, USA : 15-19 November 2009. : 2009 AWWA-water quality technology conference : American Water Works Association WQTC conference : AWWA water quality technical conference : AWWA water quality technology conference and exhibition : Nov 2009, Seattle, WA.
Water quality technology conference and exposition 2009 : Seattle, Washington, USA : 15-19 November 2009. : 2009 AWWA-water quality technology conference : American Water Works Association WQTC conference : AWWA water quality technical conference : AWWA water quality technology conference and exhibition : Nov 2009, Seattle, WA.