1. On dust, fogs and clouds;John,1880
2. Collected Papers;John,1923
3. Tropospheric aerosols;Blifford;J. geophys. Res.,1970
4. A self-contained automatic and portable apparatus for the counting of particles;Cabrol;J. Aerosol Sci.,1972
5. Skin scales among airborne particles;Clark;J. Hyg. Cambridge,1974