A collection of Vietnamese and French documents consisting of newspaper and research on the Ho Citadel are on display in central Thanh Hoa Province's Library.

The 500-piece collection includes literature and art works of Vietnamese and foreign scholars published before 1945.

The collection gives a panorama of the Ho Citadel, Ho Quy Ly dynasty (1400-07) and publications about the citadel when UNESCO recognised it as a world cultural heritage site in June 2011.

Valuable French photos of the Ho Citadel taken from the air by the Indochina Military Airbase, the stone exploitation of Vietnamese workers for the citadel construction, and a book entitled La Province de Thanh Hoa have been considered the most unique resources for study.

The exhibition is one of a series of cultural festivals held in the Ho Citadel as part of the June ceremony to receive official certification of a world culture heritage site.

The ceremony will be held at the Ho Citadel's Heritage Preservation Centre in Thanh Hoa on June 16