Secretary of State's guidance : exfoliation of vermiculite and expansion of perlite /
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 I.
Caption title.
PG3/7(91)
Air
Vermiculite.
Perlite industry