The library's online catalog contains approximately 100,000 entries and includes bibliographic records for imprints, periodicals, manuscript and ephemera holdings, photographs, and archival resources. With records combined into a single database, researchers can discover the library’s complete holdings on any given topic, person, or organization through a single search.

Additionally, WinterCat provides a link to the library's digital collections, as well as to lists of Winterthur MA theses, archival finding aids, and new acquisitions in the Joseph Downs Collection of Manuscripts and Printed Ephemera.

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