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- Language: English
- Year: 1996

- Author: Robert G. Allen
- Language: English
- Year: 2005

- Author: Robert C. Allen
- Language: English
- Year: 1995

- Author: Robert G. Allen
- Language: English
- Year: 1987

- Author: Robert C. Allen
- Language: English
- Year: 1992

- Author: Robert Ewing Allen Hunt (auth.)
- Language: English
- Year: 2009

- Author: Robert B. Allen William G. Lee
- Language: English
- Year: 2006

- Author: Kurt W. Mortensen Robert G. Allen
- Language: English
- Year: 2004

- Author: Kurt W. Mortensen Robert G. Allen
- Language: English
- Year: 2004