Möller Manuscript
From pipe-organ.wiki
D-B Mus.ms. 40644, also known as the Möller Manuscript (de: Möllersche Handschrift), is a manuscript held at the Staatsbibliothek, Berlin. It is written by Johann Sebastian Bach, Johann Christian Bach and other unidentified scribes[Citation needed]. Among other things, it contains the only copy of the Great Prelude in E-minor by Nicolaus Bruhns.
Links
Online facsimile: Staatsbibliothek, Berlin, accessed 12 August, 2023. Mirrored IMSLP579060