1. MS Mus. 1813/2/1/258-264 Reference (shelfmark): MS Mus. 1813/2/1/258-264 Title: Iannis Xenakis: Rufina Ampenoff's files Scope & Content: Correspondence and papers relating to the composer Iannis Xenakis (1922–2001), created or accumulated by Rufina Ampenoff (1912?–1993?). Collection Area: Music Collections Languages: English, French, German, Italian, and Polish Date Range: 1962-1978 Extent: 6 boxes, 1 envelope
2. MS Mus. 1813/2/1/262 Reference (shelfmark): MS Mus. 1813/2/1/262 Title: Iannis Xenakis: General files, 1965–1970. Part 2 of 2 Scope & Content: Rufina Ampenoff's files. Correspondence and papers involving or relating to the production of Iannis Xenakis' works. Collection Area: Music Collections Languages: English, French, German, and Italian Date Range: 1965-1970 Extent: 1 box (4 folders, 11 sub-files)
3. MS Mus. 1813/2/1/262/1 Reference (shelfmark): MS Mus. 1813/2/1/262/1 Title: Recordings, 1968–1969 Scope & Content: Papers and correspondence concerning various commercial recordings made of Iannis Xenakis' works. This file was originally entitled 'Xenakis – Promotion' and held in a packet marked 'Xenakis – 1965–1970 – files'. Collection Area: Music Collections Languages: English, French, and Italian Date Range: Jul 1968-Oct 1969 Extent: 1 sub-file