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Graptolity rannego silura v Kazakhstane
A. M. Obut · Izd-vo "Nauka"
54 sayfa · 1966
Graptolites / Paleontology / Catechetics / Catholic Church
Ordovik Sibirskoĭ platformy
A. M. Obut, A. V. Kanygin · "Nauka," Sibirskoe otd-nie
227 sayfa · 1984
Geology / Stratigraphic Geology / Paleontology
Graptolity, konodonty i stratigrafii︠a︡ silura, nizhnego devona Severnogo Kavkaza
E. A. Elkin, A. M. Obut · "Nauka," Sibirskoe otd-nie
220 sayfa · 1988
Conodonts / Graptolites / Paleontology