HOLLIS (Harvard Online Library Information System) is a database containing over 9 million records for more than 15 million books, journals, manuscripts, government documents, maps, microforms, music scores, sound recordings, visual materials, and data files.
OASIS (Online Archival Search Information System) provides access finding aids for archival and manuscript collections at Harvard which contain a wide variety of materials, including letters, diaries, photographs, drawings, printed material, and objects.
A growing number of our finding aids are available as PDFs on the Archive Collection page.
Search archival finding aids on OASIS.
VIA (Visual Information Access) is a union catalog of visual resources at Harvard and includes catalog records for objects or images owned, held or licensed by Harvard.
Search for visual resources on VIA.
Search citations to letters to and from Arnold Arboretum staff dating from the 1880s to 1940 in our Correspondence Database.