It was created in 1960 in the structure of Reference and Information Department. As a self-contained structural unit in the library was established in 1970. The department's priority is the search, processing and providing accurate and complete information about the social and economic life, science, culture, education and arts in the Plovdiv region from antiquity to the present day. Through the reference booklet, which includes annotated bibliographic information about events, facts and personalities from 1844 to the present day, The Local History Department works as an information mediator between the users and the library fund. The Department prepares retrospective local history bibliographic directories containing materials described by sources received on a deposit. In the period 1965–1990 a current bibliographical index “Plovdiv District” was published, which reflects the whole life of the settlements in the region. After 1991, an automated database with more than 350,000 records was built.

The Department maintains the following collections with the relevant reference apparatus:
• Autograph books by Plovdiv authors, members of the Writers' Association in Plovdiv;
• Manuscripts, donated author's manuscripts of published and unreleased works of art, memories, scientific researches, biographies, notes;
• Decorative-monumental projects of realized and unrealized works of Plovdiv artists such as John Leviev, Dimitar Kirov, Encho Pironkov, Anastasia Kmetova etc.;
• Posters of Plovdiv artists and posters of Plovdiv themes, revealed through a unique picture file;
• Audiovisual collection containing slides and negatives of recorded artistic and creative events on the territory of the city: productions of Drama Theater “N. O. Masalitinov”, Plovdiv Opera and Puppet Theater – Plovdiv, as well as programs, posters and invitations for events; pictorial, graphic and sculptural works of Plovdiv artists from independent and general exhibitions.
The department conducts oral references and information searches. Written thematic bibliographic references are made against payment.

From 2015, the department maintains a Virtual LOCAL HISTORY Service.

Since 2018, a module called Local History has been included in the e-catalog, which provides information on local history texts published since 2005.

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