I want to share with you a great site Online Chopin Variorum Edition contains many autograph manuscripts of the great Polish composer Frederic Chopin. The site is for a project at the University of London, so thank and congratulate director John Rink for such a wonderful project and we encourage further development. To date, June 2014, are available to view Scherzos, Preludes, Ballads, Polonaise Fantasy and Fantasy Op 49. The work includes, besides being able to observe every detail of the manuscripts, very interesting observations.
Link: autograph manuscripts of chopin