| RefNo | Title | Date |
| L/E/43/21 | Information from Others \ Letter to Lisa Ullmann from Hans J. Sachs | 21 October 1969 |
| L/E/51/81 | Letters \ Letter to Felicia and Hans Sachs, Boston | 1941 |
| L/E/69/64 | Biographical Information \ Rudolf Laban \ Correspondence between Lisa Ullmann, Felicia Sachs and Hans Sachs | 04/01/1965-24/02/1965 |
| L/E/51/94 | Letters \ Correspondence with Felicia and Hans Sachs | 23 February 1941-17 June 1957 |
| LU/E/15/22 | Biographical Information \ Correspondence about Rudolf Laban's Work (19 of 22) | 1970 |