1. American Conference of Governmental Industrial Hygienists. Silica, crystalline-quartz. In: ACGIH. Documentation of the threshold limit values and biological exposure indices for 1986–7,1986
2. Crystalline silica;Health; Executive, Safety
3. Recommended health-based limits in occupational exposure to selected mineral dusts (silica coal);World Health Organisation,1986
4. The eVect of quartz and other non-coal dusts in coalworkers’ pneumoconiosis. Part 1. Epidemiological studies;Walton, W.H.; Dodgson, J.; Hadden, G.G.,1975
5. Dust conditions in brick plants of Ontario;Am Ind Hyg Assoc J,1972