The study of the breakthroughs of the Amu-Darya River formed during its spill in the summer in 1878: (from maps and features)

The study of the breakthroughs of the Amu-Darya River, formed during its spill in the summer in 1878: (from maps and features) / Helman, Christopher Vsevolodovich.- Tiflis: Type.Ch.Ex.Viceroy Kavk., 1879. -605: Territory..Source of an electronic copy: Russian Geographical Society