1. The warmth factor in comfort at work;Bedford;Report, Industrial Health Research Board,1936
2. On methods of measuring skin temperature;Bedford;Report, Industrial Health Research Board,1934
3. BS 4275. Recommendations for the selection, use and maintenance of Respiratory Protective Devices;British Standards Institution,1968
4. BS 4558. Specification for positive pressure powered dust respirators;British Standards Institution,1970
5. BS 5240. Specification for general purpose industrial safety helmets;British Standards Institution,1975