| | |
| 1 | Heyworth CBC interview, “Urtexte,” 9/2-5/1969 | 48/1-2 |
| 2 | Heyworth CBC interviews, 1969, 1970, 1972 | 48/1-4 |
| 4 | Bregstein interview with Otto Klemperer | 47/8 |
| 4 | Bregstein interview with Lotte Klemperer and filmscript | 47/6 |
| 4 | Bregstein interview with Katja Mann | 55/13 |
| 5 | Universal Edition correspondence | 45/7-9 |
| 6 | B. Schott’s Söhne | 45/2 |
| 7 | Heyworth interview, 1969, West German Radio | 48/5-6 |
| 8 | Broadcasts by and about Otto Klemperer | 47/5, 9-10; 48/7 |
| 47 | Radio programs about the Kroll Opera | 51/1-3 |
| 53 | Los Angeles Philharmonic programs, 1933-1939 | 51/20-23 |
| 72 | Rée family | 45/1 |
| 73 | Family biographical papers | 44/100, 106/5 |
| 74 | Family papers - register | 44/3 |
| 75 | Family biographical papers | 44, 100, 106, MapCase 3 |
| 80 | California State University | 45/3 |
| 80 | Royal Academy of Music | 45/5 |
| 80 | Santa Monica College | 45/6 |
| 81 | United States press clippings, 1926-1972 | 106/6 |
| 82 | Otto Klemperer/Hilborn files; Loeb and Loeb | 49/11-13 |
| 82 | Citizenship certificates/passports | 49/2 |
| 82 | Life insurance | 49/6 |
| 83 | Freedom of Information Act; State Department files | 49/1-10 |
| Notebook A | Kroll Opera | 50, 51 |
| Notebook B | Otto Klemperer writings/statements | 46 |
| Notebook C | Articles about Otto Klemperer | 47 |
