Subject
- Operation Red1
- Pamphlets1
- Papers2
- Photographs3
- Postcards1
- Precipitation (Meteorology) -- Measurement..1
- Project Cirrus1
- Project Skyfire1
- Rain and rainfall.1
- Rain-making1
- Research Notes1
- Rsums (personnel records)1
- Schenectady, New York1
- Silver Iodide1
- Slides (photographs)2
- Smoke screens.1
- Snowflakes1
- Solar energy1
- Sound recordings1
- Supercooled clouds1