Source: The International Inventory of Musical Sources - Répertoire International des Sources Musicales (RISM) 
The International Inventory of Musical Sources - Répertoire International des Sources Musicales (RISM) - is a multinational, non-profit joint venture which aims for comprehensive documentation of extant musical sources worldwide. In September, 2008, the U.S. RISM Office embarked on a two-year project to catalog music manuscripts. The article posted on 15th June 2010 may be viewed here.