 Supplement 4The Freshwater Clams from the Family Sphaeriidae (Mollusca: Bivalvia) in Bulgaria [in Bulgarian] |
| Supplement 3Faunistic diversity of Vrachanski Balkan Nature Park |
 Supplement 2Zoogeography of Bulgaria. Bibliography. Scroll 2 [in Bulgarian] |
| Supplement 1On the family Mycetophilidae (Insecta: Diptera) in Bulgaria |
