Free public domain sheet music from IMSLP / Petrucci Music Library
Boston: Arthur P. Schmidt, 1903. Plate A.P.S. 6220.
Edition Schmidt, No.88.
Public Domain [tag/del]
Original scans: 300dpi grayscale JPEG2000 images around 2800 by 3600 pixels. Converted to black and white, cleaned up, deskewed, and re-sampled to 600dpi.
||20 Preludes for the Pianoforte in the Form of Short Technical Studies