- Author: Bloetscher Frederick
- Language: English
- Year: 2009
- Author: Von Huben Harry
- Language: English
- Year: 1999
- Author: Joseph Ritter Joseph Ritter
- Language: English
- Year: 2010
- Author: Nancy McTigue
- Language: English
- Year: 2010
- Author: Richard P. Beverly
- Language: English
- Year: 2012
- Author: Nancy McTigue
- Language: English
- Year: 2010
- Author: Raftelis Financial Consultants Inc
- Language: English
- Year: 2009
- Author: American Water Works Association American Water Works Association
- Language: English
- Year: 2011