Fryderyk Chopin. Polonaises, Op. 40: Facsimile Edition of the Manuscript Held in the British Library in London, commentary by Zofia Chechlinska. Facsimile Edition A VI/40 (Warsaw: The Fryderyk Chopin Institute, 2015), 2 vols, 12 and 55 pp. € 67. - Fryderyk Chopin. Mazurka in A flat major: Facsimile Edition of the Manuscript Held in the Bibliothèque Polonaise in Paris (MAM Rkp. 973), commentary by Irena Poniatowska. Facsimile Edition A IV/WN 45 (Warsaw: The Fryderyk Chopin Institute, 2015), 2 vols, 2 and 92 pp. € 48