The Prelinger Library is a public library in San Francisco, CA. The library is primarily a collection of 19th and 20th century historical ephemera, periodicals, maps, and books, most published in the United States. Much of the collection is image-rich, and in the public domain. The library uses a geospatial taxonomy that “classifies subjects spatially and conceptually beginning with the physical world, moving into representation and culture, and ending with abstractions of society and theory. ” The collection includes published books, ephemera and zines, as well as oversize and standalone collections. The library also support research and artist residencies, and hosts an open-access digital collection of selected books.