Mullakaev, A.I., Sungatullin, R.K., Mingazutdinov, A.N. and Kosarev, Y.S. 2025. Lithology of bituminous sandstones of Ashalchinskoye deposit, South Tatar arch. Proceedings of Voronezh State University. Series: Geology. 2 (Jul. 2025), 13-21. DOI:https://doi.org/10.17308/geology/1609-0691/2025/2/13-21.