Most of the material used in preparing this history came from the Air Products History Office. The core collection consists of the approximately one thousand files drawn from the papers of the founder, Leonard Pool, as well as those of his immediate successor, Edward Donley. The History Office also holds transcripts of thirty-five oral history interviews. Additional documents came from a range of corporate offices, including the technical libraries and the office of the Corporate Secretary.
Supplementary materials were obtained from the National Archives and other federal agencies, including the National Aeronautics and Space Administration, the National Air and Space Museum, the U.S. Air Force, the U.S. Census Bureau, and the U. S. Patent Office; from the Charles F. Brush papers, Special Collections, Freihergen Library, Case Western Reserve University, Cleveland, Ohio; from the Hagley Museum and Library; from the Probate Court of Wayne County, Detroit, Michigan; as well as from the libraries of the University of Pennsylvania, Princeton University, Lehigh University, Rutgers University, and of the cities of Philadelphia, Emmaus, and Allentown.
Air Products and Inc. Chemicals, Annual Report, 1945- 1989.
Air Reduction, Annual Report, 1920- 1988.