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RISM : Répertoire International des Sources Musicales
RISM : Répertoire International des Sources Musicales is an international inventory of musical sources. Founded in 1952, RISM is a joint project sponsored by IAML (International Association of Music Libraries) and IMS (International Musicological Society). RISM strives for comprehensive documentation of extant primary musical sources worldwide: music manuscripts, printed music, writings on music theory, and libretti that are housed in libraries, archives, monasteries, schools, and private collections.
RISM establishes what exists and where it can be found.
Many libraries work together with RISM by having their collections cataloged by RISM or by making catalog data available. The Bavarian State Library and the State Library of Berlin provide direct technical resources for RISM.
RISM has contractual agreements in place with several institutions. You can go directly to their catalogs from the link below.