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- Language: English
- Year: 2009
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- Language: English
- Year: 2013
- Author: Kenneth R. Bowling, Donald R. Kennon
- Language: English
- Year: 2005
- Author: Martha Derthick
- Language: English
- Year: 2001
- Author: Robert H. Duke
- Language: English
- Year: 2014
- Author: Jack W. Meek, Kurt Thurmaier
- Language: English
- Year: 2011
- Author: Paul E. Peterson, Daniel Nadler
- Language: English
- Year: 2014
- Author: Matthew Spalding, Eugene Hickok
- Language: English
- Year: 2007