The 1972 World Heritage Convention links together in a single document the concepts of nature conservation and the preservation of cultural properties.

UNESCO: UK National Commission for UNESCO - UNESCO Conventions, Recommendations & Declarations in the UK

The most significant feature of the 1972 World Heritage Convention is that it binds in a single document the concepts of nature conservation and the preservation of cultural properties and sets out the duties of member-states and the international community for the preservation of monuments of world heritage.

UNESCO: Convention on World Cultural and Natural Heritage

The 1972 Convention for Protection of the World Cultural and Natural Heritage developed from the merging of two separate movements: the first focusing on the preservation of cultural sites, and the other on the conservation of nature.

UNESCO: UK National Commission for UNESCO :: Convention on the Protection of World Cultural and Natural Heritage (1972)

What I think the method is giving us is a skew, a bias, towards older dates by the very nature of the preservation.

BBC: Last-stand Neanderthals queried

The project takes into consideration the sensitive nature of the oral and intangible heritage which makes its preservation complex and delicate.

UNESCO: Outline of Digital Archiving Project