- Author: Richard A. Walker, William Cronon
- Language: English
- Year: 2008
- Author: Andrew Walker William Kennedy
- Language: English
- Year: 2023
- Author: Brett L. Walker, William Cronon
- Language: English
- Author: Elaine Treharne, Greg Walker, Greg Walker, William Green
- Language: English
- Year: 2010
- Author: Felice Dan, Walker William L
- Language: English
- Year: 2007
- Author: Walker William R
- Language: English
- Author: Brett L. Walker William Cronon
- Language: English
- Year: 2008
- Author: Brett L Walker William Cronon
- Language: English
- Year: 2010
- Author: Walker William T
- Language: English
- Year: 2015