Collections : [Yale University -Irving S. Gilmore Music Library]

Primarily containing material directly relating to Isidore Troostwyk, circa 1890-1911 ; material relating to other family members.

Primarily containing material directly relating to Leo Troostwyk, circa 1910-1916 ; material relating to other family members, especially Hendrika Troostwyk.

Relating to the activities of the New Haven String Orchestra ; programs from performances by the students of the Yale University School of Music ; clippings and programs relating to the Bridgeport Symphony, circa 1907-1922.