A file of documents concerning Bulgarian-Yugoslav political relations. Subjects discussed in the file include the trafficking of heroin from Bulgaria to Yugoslavia; relations between Bulgaria and the individual Yugoslav republics; and official visits exchanged between Bulgaria and Yugoslavia, including a visit to Bulgaria by the Yugoslav foreign minister, Josip Vrhovec. Other subjects discussed in the file include tensions in Bulgarian-Yugoslav relations regarding the status of Macedonia; reports of Bulgarian troops being concentrated at the Yugoslav border; Bulgarian-Yugoslav trade relations; the Bulgarian response to the death of the Yugoslav president, Josip Tito; and Yugoslav press commentary on Bulgarian celebrations on the anniversary of the Treaty of San Stefano, which liberated Bulgaria from the Ottoman Empire.