The correspondence files document Kissinger's career after leaving government service in 1977 through 2001. They include correspondence from Kissinger's office in Washington, DC, as well as the office he opened in New York in 1983. An attempt has been made to remove the large number of duplicates from these overlapping correspondence files. The Washington and New York files contain incoming and outgoing letters, enclosures and printed e-mail that document Kissinger's contacts with the press, business leaders, foreign officials, friends, academics and the foreign policy community. Most material is filed under the last name of the correspondent or organization name, but a small amount is filed under the names of countries or other subject terms.