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1. Dunning, John R. Chronoscope
Dunning, John R. (John Ray), 1907-1975
- Name: Dunning, John R. (John Ray), 1907-1975 (Speaker)
- Collection Name: Columbia University Historical Recordings. Series III: Film and Tape Reels. Box no. 17, Item no. Reel 7
- Date: March 4, 1953
2. Dunning, John R. The Columbia Cyclotron
Dunning, John R. (John Ray), 1907-1975
- Name: Dunning, John R. (John Ray), 1907-1975 (Speaker)
- Collection Name: Columbia University Historical Recordings. Series III: Film and Tape Reels. Box no. 17, Item no. Reel 6
- Date: January 24, 1954