After his death in 1942 his heirs continued to develop the collection, and donated it to the British Library in 1986.The collection includes many literary and music manuscripts, mainly in the composers' own hands.The bulk of the collection consists of 131 autograph manuscripts by notable composers; most, but not all, are musical scores.One particularly prominent item is Mozart's "Verzeichnüß aller meiner Werke" (MS 63),[2] his own handwritten thematic catalogue of his works from 1784 to 1791.[4] Zweig MS 206 was given separately from the main collection, in 1989, and is a manuscript of a biography of Luca Signorelli by Giorgio Vasari, copied from Lives of the Most Excellent Painters, Sculptors, and Architects.