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2. L. E. Wood,Automatic Weather Stations, J. Meteor.3 (1946), 115.
3. R. E. Falconer,A Method for Obtaining a Continuous Record of the Type of Clouds in the Sky During the Day, Occasional Report Number 8 Project Cirrus, Contract No. W-36-039-SC-32427, G. E. Research Lab. Report RL 145, March (1949).
4. Austin Hogan,Small Ion Concentrations Within and in the Vicinity of Clouds and Fog (in Press).