Historia naturalis bulgarica, Volume 4 (1993)

Boev, Zlatozar — Osteological collections and their significance for the ornithological researches: 3—9 (in Bulgarian, summary in English).

Stefanov, Pavel — A little known herbarium of Lady Emily Strangford: 10—15 (in Bulgarian, summary in English).

Popov, Alexi — Raphidiopteren und Neuropteren aus Bulgarien in den Sammlungen des Nationalmuseums in Prag: 16—28 (in German, summary in Bulgarian).

Andreev, Nikolai — Materials and critical notes on Bulgarian flora: 29—38 (in Bulgarian, summary in English).

Kumanski, Krasimir — Addition to Volume 15 (Trichoptera, Annulipalpia) and Volume 19 (Trichoptera, Integripalpia) of the series Fauna of Bulgaria: 39—46 (in Bulgarian, summary in English).

Boev, Zlatozar — Species composition and metric characterization of the birds-victims of the eagle owl (Bubo bubo (L., 1758)) (Aves, Strigidae): 47—56 (in Bulgarian, summary in English).

Boev, Zlatozar — Neolithic birds from the prehistoric settlement at Kazanluk: 57—67 (in Bulgarian, summary in English).

Boev, Zlatozar; Ribarov, Georgi — Birds from the ancient town of Kabyle (1-st millenium B. C. — 6-th century A. D.) near Kabyle (Burgas district): 68—77 (in Bulgarian, summary in English).

Boev, Zlatozar — National Museum of Natural History and the protection of nature in Bulgaria: 78—86 (in Bulgarian, summary in English).

Stanev, Stefan — Little known names in Bulgarian botany. Alexander K. Drenovsky: 87 (in Bulgarian, summary in English).