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The inspiration for Schaefer's work with cloud seeding began during his experiments with Irving Langmuir during World War II. At that time they were under contract with the military for other weather-related reasons, but their research led them to wonder about the possibilities of controlling weather beyond military needs. Schaefer accomplished some of his most important foundational work with cloud seeding in 1946, before General Electric joined in another contract with the U.S. Navy, Air Force, and Army Signal Corps. These records document some of Schaefer's initial work with cloud seeding, before the official birth of Project Cirrus. Researchers will also find about a dozen files on Project Blowdown, a cloud seeding operation conducted in Honduras to aid the United Fruit Company.