Secretary of State's guidance : boilers and furnaces, 20-50 MW net rated thermal input /
Great Britain.Department of the Environment.
Great Britain.Scottish Office.
Great Britain.Welsh Office.
Great Britain.Environmental Protection Act 1990.
London : HMSO,
1991.
At head of title: Environmental Protection Act 1990, Part, 1.
Caption title.
"PG1/3(91)"
Air
Boilers
Furnaces