These are unique documents coveted by a large world of music.

This is believed to be a unique document.

The museum houses a rotating collection of unique documents and artifacts.

This series of gouaches is an extraordinary and unique document.

It is a unique document in Pestalozzi's work that shows the connection of his political, social and educational influence.

A state-outlined contract is easier to uphold than a unique document like a living will.

While the Model shares some similarities with each of the eight agreements, it is a unique document in and of itself.

"Such a unique document would be most difficult to realize a profit on."

He added that National Geographic had taken on the project because it saw an opportunity to help save a unique document.

It is a unique document that says who does what, when and how.