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This series contains a number of documents that shed light on Lowe's personal life: photocopies of his British naturalization papers and academic degrees, a photograph and pamphlet produced in conjunction with a celebration at the University of Kiel, death notices and eulogies he delivered at the funerals of friends, a history of a charitable organization he helped to establish, materials generated in connection with his eightieth birthday party, and a bound volume of greetings presented to him on his one-hundredth birthday.

This series documents the Project Cirrus program, a weather modification initiative undertaken by GE along with the United States Signal Corps, Office of Naval Research, and the United States Air Force, with general oversight handled by the Department of Defense. As part of the effort, Dr. Vonnegut discovered that AgI, Silver Iodide, was a superior nucleation agent. This discovery significantly influenced the science of artificial precipitation and this method came to be adopted as the chief means of "rain making".