Fossil coals of Ryazan province

Assonov, Vl.A.Fossil coals of Ryazan province / Ryas.lips.plan.Comm.- Ryazan: State.Type., 1929. -38 s.: Tab .. -Decree.Lit.and materials used in the preparation of the article and the list of coal deposits Ryas.lips: with.35-38.- Ot.From vol.6 materials to plan Nar.Khoz vas.lips."Useful fossil rods. Lips."..-300 cop..Electronic Source: PB