A component of the Memory of the World Programme.
The Memory of the World Register is a compendium of documents, manuscripts, oral traditions, audio-visual materials, library, and archival holdings of universal value. Inscription on the Register leads to improved conservation of the documentary heritage by calling upon the program's networks of experts to exchange information and raise resources for the preservation, digitization, and dissemination of the material. The program also has the goal of using state-of-the-art technologies to provide wider accessibility and diffusion of the items inscribed on the Register.
More information on the Wikipedia page 
The website is