Izvestiia na Tsarskitia prirodonauchni instituti v Sofiia = Mitteilungen aus den Konigl. naturwissenschaftlichen Instituten in Sofia, Bulgarien = Bulletin des Institutions royales d'histoire naturelle á Sofia, Bulgarie kn. 7-8 (1934-35)
Bulgarian and German text with t.p. also in French Includes bibliographical references kn. 16 (1943)
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