It is a study of Polish immigrants and their families based on personal documents.

That finding turned out to be based on forged documents.

This report was based on previously classified documents made available by the Obama administration in 2010.

Instead, they have only the dry, cold feeling of studies based largely on official documents.

His colleagues said the information was based on documents declassified 10 years ago.

The article was based on documents that are under court seal.

The newspaper based its charges on several interviews and official documents.

The certificate itself is issued by the authorities, usually based on such documents.

Much of the test has questions based on documents and demands analysis rather than memorization.

The first, and more accepted, is based on documents dating back to the early 16th century.