Slovenia
 Leopold I (1640 – 1705), Holy Roman Emperor. Patent of ennobelment granted to Andreas Knissetz. November 15, 1664. Vienna.
Leopold I (1640 – 1705), Holy Roman Emperor. Patent of ennobelment granted to Andreas Knissetz. November 15, 1664. Vienna.
7 ff., 297 x 238 mm, parchment, red wax seal.Coll. 979. H. and E. Costa. Fol. 3 v. – 4 r.
 Vodnik, Valentin (1758 – 1819), first Slovenian poet. Letter to his lessor. March 21, 1794. Koprivnik.
Vodnik, Valentin (1758 – 1819), first Slovenian poet. Letter to his lessor. March 21, 1794. Koprivnik.
2 ff., 226 x 415 mm, paper. Coll. 979. H. and E. Costa. Fol. 1 r. – 1 v.
 Lantheri, Franz Anthoni, Count of. Edict imposing the vow of silence upon the Slovenian clergyman Manigh. August 22, 1711. Laibach.
Lantheri, Franz Anthoni, Count of. Edict imposing the vow of silence upon the Slovenian clergyman Manigh. August 22, 1711. Laibach.
1 f., 315 x 415 mm, paper. Coll. 979. H. and E. Costa. Fol. 1 r.
 Deed of the purchase of a mill by Juano Basiach from  Baptista di Mireo of Tergeste. March 19, 1497.
Deed of the purchase of a mill by Juano Basiach from  Baptista di Mireo of Tergeste. March 19, 1497. 1 f., 217 x 138 mm, parchment. Coll. 979. H. and E. Costa. Fol. 1 r.
The collection of historian Henrik Costa (1799 – 1870) and his son Etbin Costa (1832 – 1875), a politician, consists of hand-written and printed documents relating to the history of Slovenia in the 15th – 19th centuries.