PneumoconiosisCoal MiningAnthracosisCoalMiningSilicosisDustDental TechniciansX-Ray FilmCaplan SyndromeAsbestosisTalcOccupational ExposureQuartzKaolinWorkers' CompensationSilicon DioxidePolyvinyl ChlorideRadiography, ThoracicLungOccupational DiseasesMaximum Allowable ConcentrationSiderosisMass Chest X-RayNational Institute for Occupational Safety and Health (U.S.)WeldingPulmonary FibrosisVital CapacityMetallurgyAsbestosAppalachian RegionAluminum SilicatesAir Pollutants, OccupationalRespiration DisordersBronchitisRheumatoid NoduleLaboratories, DentalPolyvinylsForced Expiratory Volume