ISSN 1314-1155
- Title: Izvestiya na Tsarskite Prirodonauchni Instituti v Sofiya
- Bulgarian: Известия на Царските природонаучни институти в София
- German: Mitteilungen aus den Königl. naturwissenschaftlichen Instituten in Sofia, Bulgarien
- French: Bulletin des Institutions royales d'histoire naturelle à Sofia, Bulgarie
- Abbreviation: Izv. Tsarsk. Prir. Inst. Sofiya
- Dates: 1-16, 1928-43
- Online access: NMNHS
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