11. Specification for pressed steel gutters, rainwater pipes, fittings and accessories. (4th December 1963) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (22 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
12. Specification for unplasticized PVC soil and ventilating pipes, fittings and accessories. (29th April 1983) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (18 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗
13. Unplasticized polyvinyl chloride (PVC-U) rainwater goods and accessories. Half-round gutters and circular pipe Part 1, (1st February 1971) Authors: British Standards Institution, Record Type: Book Extent: 1 online resource (33 pages) View Content: Available online (eLD content is only available in our Reading Rooms) ↗