Records of the Weather Bureau
(Record Group 27)
1735-1979
http://www.archives.gov/research/guide-fed-records/groups/027.html


Ross Gunn and B. B. Phillips, U. S. Weather Bureau
AN EXPERIMENTAL INVESTIGATION OF THE EFFECT OF AIR POLLUTION ON THE INITIATION OF RAIN
in: Journal of the Atmospheric Sciences 14, 1957, 272-280
Link: http://dx.doi.org/10.1175/1520-0469(1957)014<0272:AEIOTE>2.0.CO;2

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