Annual report /
Great Britain.Director General of Electricity Supply for Northern Ireland.
Great Britain.Director General of Gas for Northern Ireland.
Great Britain.Office for the Regulation of Electricity & Gas.
Belfast : HMSO,
1996-
At foot of title: Ofreg: Office for the Regulation of Electricity & Gas.
Great Britain. Director General of Electricity Supply for Northern Ireland
Great Britain. Director General of Gas for Northern Ireland