1. An analytical study of trace elements in the atmospheric environment;Cawse;A.E.R.E. R.7134,1972
2. A calibration of the filter-paper method of estimation of smoke;Coulson;Br. J. Appl. Phys.,1963
3. The photoelectric measurement of coal dust stains on filter paper;Davies;Br. J. Appl. Phys.,1931
4. The estimation of particulate air pollution from the soiling of filter paper;Ellison;Staub,1968
5. Dithizone method, modified;Harrold;J. Ind. Hyg.,1936