Bibliographic information about the displayed CFEO source is given first by specifying the siglum of the institution or collection where the source is located (see Library and other sigla), and then the shelfmark. It should be noted that for the works with orchestra, the solo part in CFEO generally does not come from the library that furnished images of the orchestral parts. (For example, for the Grande Polonaise Op. 22, CFEO provides images of the piano part held by the Bibliothèque Nationale de France and of the orchestral parts held by the British Library). Similarly, ‘composite’ editions have sometimes been assembled because the principal source lacked one or more leaves; e.g. pp. 5 and 6 of the French first edition of the Polonaise Op. 44 were supplied by the University of Chicago, while the remaining images came from the Bibliothèque Nationale de France.