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The Helm mss., 1693-1965, consist of operatic scores largely in the hands of copyists, works of Mme Laure (Cinthie Montalant) Cinti-Damoreau, 1801-1863, singer and composer, and documents connected with the opera in Bologna, collected by Everett Helm, 1913-1999, composer and musicologist of New York and Asolo, Italy.

The Miscellaneous mss., 2100 BCE-1970, consist of individual items acquired individually either as a gift or purchased from a variety of sources.

The Ricketts mss., 9th-19th cent., are illuminated medieval and renaissance manuscripts assembled by Coella Lindsay Ricketts, 1859-1941, calligrapher, of Chicago, Illinois. Most of the material relates to religious matters.