legal document
legal instrument
official document
instrument ***

The paper was an official document, but not from the American government.

In official documents the name of the village has changed many times.

It has been used in official documents since at least 1867.

The name first appeared on an official document in 1646.

According to official documents, this one will cost about $6 billion.

I haven't looked at any of the official documents you keep here.

Already the President of the country was using this word in official documents sent to the congress.

He appears in the official documents for the first time around 1469.

The grand father's name is usually only used in official documents.

At any rate, there is nothing on the subject in the official documents we have been given.