Radon in dwellings in Sweden : Paper presented at the symposium on Natural Radiation Environment III, Houston, Texas, April 23-28, 1978 Swedjemark G A Statens strålskyddsinstitut (SSI) 1978-04
Operation Plumbomb : Blast effect on an air-cleaning system Billings C E · Dennis R Health and Safety Executive (HSE) 1957-11-15