| title | ISBN-13 | year of publica- tion | other author(s) | 
|---|---|---|---|
| 100 Walks in Somerset and Avon | 978-1-85223-766-0 | 1993 | |
| Ants | 978-0-85546-305-2 | 1996 | Gary J. Skinner | 
| Hydraulic Lime Mortar for Stone, Brick and Block Masonry: A Best Practice Guide | 978-1-873394-64-9 | 2003 | |
| Olivia and the Dulcinites: An ancient convent, depraved nuns, and perverted rituals: Volume 2 | 978-1-901388-01-5 | 2015 | |
| Protein Volume 1 | 978-0-08-097221-3 | 2011 | |
| Sisters in Chains: | 978-1-908252-11-1 | 2011 | |
| Sisters in Chains: An Africanus Novel | 978-1-904706-64-9 | 2008 | |
Dr Geoffrey Allen Pigman · G. A. · G. Allen · Geoffrey A. · Geoffrey Allen Pigman · Geoffrey C. Allen · Geoffrey F. Allen · Geoffrey Freeman Allen · Geoffrey Freeman (Ed. ) Allen · Geoffrey Freeman (editor) Allen · Geoffrey W. Allen
Babash Ryan · Cambridge House Publishing Limited · Chimera Publishing Ltd · Pergamon Press · Richmond Publishing Co Ltd · Routledge · The Crowood Press Ltd