1. A The clinical course of patient 2 has been reported previously (case 1, Seaton et al1) He had worked with hand tools on granite from 1948 until 1978 and had then worked alongside patient 1 until 1984. He wore his respirator less often than the younger man. A chest film taken in 1980 had shown no silicosis but in 1984 eggshell calcification of the hilar nodes was present as well as signs of accelerated silicosis. He died aged 54 from respiratory failure due to rapidly progressive silicosis. At necropsy his lung showed the extremely high quartz content of 21 mg/g dry tissue
2. Accelerated silicosis in Scottish stonemasons;Seaton, A.; Legge, J.S.; Henderson, J.;Lancet,1991
3. Occupational exposure limits 1997;Health; Executive, Safety
4. A new method for structured subjective assessments of past concentrations;Cherrie, J.W.; Schneider, T.; Spankie, S.;Occup Hyg,1996
5. Deposition of particles in the human respiratory tract in the size range 0.005–15 mm;Heyder, J.; Gebhart, J.; Rudolf, G.;J Aerosol Sci,1986