In Russian. Sazonova, Johanna Germanovna. Ammonites of the boundary layers of the Jurassic and Cretaceous systems of the Russian Platform. Moscow: Nedra, 1977. Ammonity pogranichnykh sloev yurskoy i melovoy sistem Russkoy platformy. In Russian /Ammonites of the boundary layers of the Jurassic and Cretaceous systems of the Russian Platform . 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. SKU7696932