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Author - title
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| details | Late Permian | USSR(Ukrainian SSR) | Acheev,B.N. et al. Stratabound type mineralization of the Paleozoic rocks of northern Osetii | 1976 | |
| details | Early Permian | USSR(Urals) | Abramova,S.A. et al. Palynological investigations of Upper Kama's potassium deposits, underlying Kungurian Salt Layers. | 1960 |