Schoenberg's manuscript at this link: https://sites.google.com/site/francescobellomi1960bis/download or http://www.schoenberg.at/ or http://www.schoenberg.at/index.php?option=com_content&view=article&id=374&Itemid=585&lang=de Andy Lee web: http://andy-lee.com/Andy_Lee_Web_Portal.html and also: http://pianosociety.com/cms/index.php?section=1597