In Russian. Markova, Natalya Gavrilovna. Stratigraphy of the Lower and Middle Paleozoic Region of Western Mongolia. Moscow: Science, 1975. Stratigrafiya Nizhnego i Srednego paleozoya Zapadnoy Mongolii. In Russian /Stratigraphy of the Lower and Middle Paleozoic Region of Western Mongolia. All images are for identification of editions only. Several books of the same edition may be available. Please feel free to request photos of available books. SKU7024652