The Columbia University Libraries Preservation and Digital Conversion Division provides a comprehensive program to prolong the existence and accessibility of the collections for current and future students and scholars. The Division is responsible for preservation of materials in all formats and genres, and for conversion of analog content to digital form. Preservation involves action taken to prevent or retard deterioration of physical materials through correct housing and environment; where possible, to improve their condition through conservation treatment; and, as necessary, to change their format in order to preserve their intellectual content. Preservation of the Libraries’ digital resources is the responsibility of the Libraries Digital Programs Division.