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Kovatcheva, T. (1969). On the age of the Urgonian sediments in the Lovech area, based on their foraminiferal content. Bulletin of the Geological Institute, series Paleontology, Publishing House of the Bulgarian Academy of Sciences. 18: 25-46 (Bulgarian with Summary in Russian and English).
Kovatcheva, T. (1969). On the age of the Urgonian sediments in the Lovech area, based on their foraminiferal content. Bulletin of the Geological Institute, series Paleontology, Publishing House of the Bulgarian Academy of Sciences. 18: 25-46 (Bulgarian with Summary in Russian and English).