The United States has published declassified intelligence documents on Argentina's last military dictatorship.

The documents amount to more than a thousand pages and were from the libraries of former US presidents Jimmy Carter, Ronald Reagan and George Bush senior.

Prior to the publication, the documents were delivered by US Secretary of State John Kerry to Argentinian President Mauricio Macri last week.

Argentina was ruled by a military dictatorship from 1976 to 1983. During this seven-year regime, an estimated 30,000 people were killed or disappeared.