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Davitashvili L.S. (1932). Тарханский и чокракский горизонты [= Tarkhan and Chokrak horizons]. Archangelsky, A.D.; Davitashvili, L.S. (eds) Rukovodyashchiye iskopayemyye neftyenosnykh rayonov Krymsko-Kavkazskoy oblasti, I-II. Trudy Gosudarstvennogo Issledovatel'skogo Neftyanogo Instituta.
Davitashvili L.S. (1932). Тарханский и чокракский горизонты [= Tarkhan and Chokrak horizons]. Archangelsky, A.D.; Davitashvili, L.S. (eds) Rukovodyashchiye iskopayemyye neftyenosnykh rayonov Krymsko-Kavkazskoy oblasti, I-II. Trudy Gosudarstvennogo Issledovatel'skogo Neftyanogo Instituta.