Source commentary: Irena Poniatowska
Mazurka in A flat major is the next volume of the series. The volume presents the manuscript held in the Bibliothèque Polonaise in Paris (MAM Rkp. 973).

‘Fryderyk Chopin’s Mazurka in A flat major (without opus number) was placed in the album of Maria Szymanowska most probably by Celina Mickiewicz. Maria Mirska presumes that after Szymanowska’s death, the album was inherited by her daughter Celina, who could have been offered the autograph either by Chopin himself or, after his death (1849), by his friend Julian Fontana, whom the composer’s family made general administrator of his musical legacy. The album was subsequently kept by Mickiewicz’s son, Władysław. As director of the Bibliothèque Polonaise, in 1903 he founded the Musée Adam Mickiewicz within the Bibliothèque. The album was probably donated to the Bibliothèque in 1931 (…)

All or part of the autograph has been reproduced in numerous publications.
The present edition is the first facsimile edition of the Mazurka in A flat major to reproduce its authentic colours and dimensions.’
From source commentary