- FondsPP - Helen Martens fonds
- Series4 - Felix Mendelssohn research
- 6494 - Untitled
- 18 more...
- File19 - Notes on keys of Mendelssohn’s songs
- File20 - Annotated analysis of Mendelssohn’s A quartet
- File21 - Sheet music written by Mendelssohn
- File22 - Annotated source on Mendelssohn
- File23 - Photocopies of sheet music and notes
- File24 - Notes on themes of Mendelssohn’s music
- File25 - Transcribed letters and notes on Mendelssohn’s son Carl
- File26 - Biography of Mendelssohn translated by W. Gage
- File27 - Annotated transcriptions of letters by Mendelssohn
- 30 more...