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| Author | : | Tzankov, V. |
| Year of publication | : | 1960 |
| Title | : | Sur le niveau stratigraphique de quelques pachyodontes urgoniens en Bulgarie. |
| Journal | : | Spisanie na blgarskoto geologichesko Druzhestvo |
| Vol/No/Pages/Plates | : | 21: 38-74 |
| Published in | : | Sofija |