Francis Younghusband in Tibet
Francis Edward Younghusband led a British expedition (or rather, a military invasion) to Lhasa in 1904 and wrote a book about it, India and Tibet, available on Google Books.
Three pages of her notes for it are included in her papers, dated April-May 1963 and DD074527 says she worked on the piece on 26.4.63, 29.4.63 and 30.4.63.
All these papers are transcribed on their individual pages, for which follow the DD123456 links.
DD074527: Appointments for "Oliver Twist", "Speech" and "F. Y. in T"
DD161751: Contents of tape 1 bands 1-6, rhythmic scores and tone sequences
DD161738: Contents of tapes 2, 3 & 4 and loops
DD161802: Notes and diagrammatic scores