PneumoconiosisCoal MiningAnthracosisCoalMiningSilicosisDustDental TechniciansX-Ray FilmCaplan SyndromeAsbestosisOccupational ExposureTalcWorkers' CompensationOccupational DiseasesQuartzKaolinSilicon DioxidePolyvinyl ChlorideRadiography, ThoracicMaximum Allowable ConcentrationLungMetallurgySiderosisMass Chest X-RayVital CapacityAir Pollutants, OccupationalNational Institute for Occupational Safety and Health (U.S.)WeldingPulmonary FibrosisAsbestosAppalachian RegionRespiration DisordersAluminum SilicatesBronchitisOccupational HealthIndustryRheumatoid NoduleConstruction MaterialsPolyvinylsOccupational MedicineLaboratories, DentalForced Expiratory Volume