Mi sono imbattuto in questo meraviglioso sito che segnalo
http://chopin.lib.uchicago.edu/
The Chopin collection at the University of Chicago Library includes over 400 first and early printed editions of musical compositions by Frédéric Chopin, maintained in the Special Collections Research Center. Because Chopin's works were often published concurrently in several countries with variant texts, scholars can establish a sequence of publication by comparing a range of printings.
Chopin Early Editions consist of digitized images of all scores in the University of Chicago Library's Chopin collection. Users can search or browse Chopin Early Editions via a variety of data points, including titles, genres, and plate numbers.
