1. Resolution 166, International Meteorological Organization, Conference of Directors, Washington, 1947.
2. Smithsonian Meteorological Tables, Sixth Revised Edition, pp. 347-350, Washington, 1951.
3. Howell, W. E., “The Growth of Cloud Droplets in Uniformly Cooled Air” ScD. Dissertation, Massachusetts Institute of Technology, 1948, also Journal of Meteorology, V. 6, p. 134, 1949.