The Free Library's Music Department has an impressive collection. Its long established collection includes recordings, scores, and special collections. It is an invaluable resource for every type of musician there is. Most items are available at little or no cost. They are located at 1901 Vine Street or call them at 215.686.5316.
Piano Trio, Mallarme Poems and Other Chamber Works by 
Complete Sonatas for Solo Instrument and Piano
The Norton Scores : a study anthology by 