Model No. 17. Sverdlovsbord's combinate. The Three Beau State. The Khramzev quarry. No. 5. Insulated and isogypsum beds and soil of I

Model No. 17. Sverdlovsbord's combinate. The Three Beau State. The Khramzev quarry. No. 5. Insulated and isogypsum beds and soil of I

 

Creation time: 1950 y.

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