Well-known for research on radar meteorology and cloud physics, Dr. Battan was a scientist who worked for the U.S. Air Force in World War Two, the Weather Bureau at the University of Chicago, and finally as a professor and head of the Department of Atmospheric Sciences at the University of Arizona. He was an authority on weather modification in both the U.S. and the Soviet Union. This collection contains research, data, publications, manuscripts, and correspondence of Battan's from 1946-1986. Subjects include weather modification, cloud physics, radar meteorology, the Thunderstorm Project, the Arizona Cloud Seeding Project, backscattering experiments, and scientific organizations related to those fields. Papers relating to conferences, meetings, lectures, and committee notes for various weather-related scientific organizations make up a large portion of the collection.