The purpose of Archival Department (Law. 1946/91) is the identification, collection, classification, indexing and finally the publication of all kinds of archival material relating to Hydra, its local history, tradition and culture. In this Hydriot historical documentation center is introduced by selection, archive material from island’s Public Services as well as files of Entities and Private Individuals, which are important sources of historical research for locale and present historically the leading role of Hydra, especially during the period of 18th to 19th and 20th century. A large archive section concerns the Community Archive of Hydra (1708-1865). In this section about 18,000 primary documents are included, manuscripts, codes and ledgers detailing outline the pre-revolutionary, revolutionary and post-revolutionary years of Hellenic history. Educational, administrative, ecclesiastical and collective records follow etc. which chronologically start from the mid-19th century, often reaching up to today.