S.N.Veletsky.The surface of the surface and irrigation of the Ufa province.

S.N.Veletsky.The surface of the surface and irrigation of the Ufa province.- -.-12.12.1899 Agreement No. 24 of 02/12/2016 category 43 manuscript of the works of members of the Russian Geographical Society and individual documents in the Ufa province, case 13..Electronic copy source: PB