- Author: Albert William Tucker (editor), Robert Duncan Luce (editor)
- Language: English
- Year: 2016
- Author: Robert Duncan (editor), Peter Quartermain (editor)
- Language: English
- Year: 2012
The H.D. Book
pdf
- Author: Robert Duncan (editor), Michael Boughn (editor), Victor Coleman (editor)
- Language: English
- Year: 2011
- Author: Gerald Haigh, Robert Duncan
- Language: English
- Year: 2015
- Author: Robert Duncan
- Language: English
- Year: 2014
- Author: Robert Duncan
- Language: English
- Year: 2017
- Author: Robert Duncan
- Language: English
- Year: 2017
- Author: Klaus Nielsen J. Robert Duncan
- Language: English
- Year: 1990
- Author: Dr. Robert Duncan
- Language: English
- Year: 2014