Published 10 January 2026
I have tried to keep these to a minimum.
| OS | Ordnance Survey |
| OSNI | Ordnance Survey of Northern Ireland |
| OSi | Ordnance Survey Ireland |
| OSGB | Ordnance Survey Great Britain |
| OiC | Office in Charge |
| PRONI | Public Record Office Northern Ireland in Belfast |
| NAI | National Archives Ireland, in Dublin |
| NA | National Archives Kew, London |
| OSi Library | The OSi library in Phoenix Park |
| OSi Glenbeigh | The OSi offsite file storage site |
| MA Dublin | Military Archives, Cathal Bruga Baracks, Dublin |
Military ranks are used in full the first time they appear in each chapter but may be abbreviated afterwards. Thus, Lieutenant Colonel becomes Lt. Col.
