- FondsBeaton - Papers of Sir Cecil Beaton
- SeriesA - Correspondence
- SubseriesA1 - General letters to Beaton
- File530 - Iris Tree. Autograph letters and postcard to Beaton.
- Item1 - Autograph letter signed to Beaton, from Munich.
- Item2 - Autograph letter signed to Beaton, from Mottisfont Abbey, Romsey, Hampshire.
- Item3 - Autograph letter signed to Beaton, from London.
- Item4 - Postcard to Beaton.