1. Evaluation of visibility measurement methods in the eastern United States;Allard,1980
2. Daytime visibility and nephelometer measurements related to its determination;Johnson,1980
3. Considerations in the measurement of visibility;Malm;J. Air Pollut. Control Ass.,1979
4. Vision Through the Atmosphere;Middleton,1952
5. A critical review of methods for defining visual range in pristine and near-pristine areas;Tombach,1978