The Daniel E. Koshland San Francisco History Center contains a comprehensive, non-circulating research collection of materials covering all aspects of San Francisco, and, to a lesser extent, the San Francisco Bay Area, California and the West, from its earliest days to the present. The Center contains both primary and secondary materials in all formats, including books, manuscript and archival collections, newspapers, ephemera, photographs, slides, films and videos in VHS and DVD format, posters and broadsides, CDs and CD-ROMs, maps, architectural plans and drawings, scrapbooks, diaries and journals, oral histories and selected artifacts. Rare San Francisco newspapers - including neighborhood newspapers, international language newspapers and early city newspapers - are also part of the collection. Popular and scholarly periodicals with a focus on San Francisco reside here, too. The Center's collection serves a wide range of patrons, from students to scholars to the general public. The Center acquires all available current and retrospective works and retains all titles and holdings, with an emphasis on long-term preservation. Weeding rarely occurs, except for condition and the addition of superior replacement copies. San Francisco Historical Photograph Collection:San Francisco topics represented in more than 250,000 photographs, negatives, photo albums, slides, postcards and other works on paper, including line drawings and paintings; more than 38,000 digital images; the San Francisco News-Call Bulletin's photo morgue of more than 1,000,000 photographs of San Francisco and beyond. Official Archives for the City and County of San Francisco: Historical records of San Francisco's departments and mayors in a variety of formats, including 19th and 20th century ledgers, blueprints, photographs, audiovisual materials and paper; departments represented include Police, Fire, Civil Service, Medical Examiner, Unified School District, Planning, Public Works and the Arts Commission. Local history: Historical records of San Francisco organizations, businesses, neighborhoods and ethnic communities documenting the social, political and business history of the city. San Francisco Public Library: Archives of the San Francisco Public Library, including the minutes from Library Commission meetings.