Curatorial roles include or have included librarians, curators, digital preservationists, archivists and keepers. This is often accomplished by archivists, librarians, scientists, historians, and scholars. The program trained top photograph archivists and conservators from around the world. Archivists and historians have noticed the transitory nature of digital media. The preservation of silent films has been a high priority for historians and archivists. Archivists did not microfilm photographs and blueprints of the Carnegie Libraries. The Academy of Certified Archivists offers supplemental archival training by means of a certification program. Salvaging old films is a major problem for film archivists (see film preservation). "Provenance" is also the title of the journal published by the Society of Georgia Archivists. Finding aids are a common reference tool created by archivists for locating materials. The educational preparation for archivists varies from country to country. LSU also has an active Society of American Archivists student chapter. This has usually been due to editing for reissue (and subsequently partly restored by archivists). The footage was already known to the studio archivists. He was also a member of the Society of California Archivists.