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  1. SOVIET CLOUD PHYSICS RESEARCH AND WEATHER MODIFICATION ACTIVITIES

    of the observed area covered by echoes.� Similar work was done by the U.S. "Thunderstorm Project ... and C (see map), have been reported, but the results of the project D have been very sketchy. ... was done by the U.S. “Thunderstorm Project” about 9 years earlier. Muchnik also made a study ...