Concept
Air filters
Catalogue
- Books
Washroom hygiene and Calmic : time for action! / Calmic Washroom Hygiene Service.
Wellcome Foundation Ltd. Industrial Division. Calmic Washroom Hygiene Service.Date: [between 1970 and 1979]- Ephemera
Environmental ephemera. Box 2.
- Books
High-efficiency air filtration / editors: P.A.F. White and S.E. Smith.
Date: 1964