Alexander Vilgelmovich Grebner.Several comments made during my excursions in the Simbirsk province.

Alexander Vilgelmovich Grebner.Several comments made during my excursions in the Simbirsk province.- 1886. -Agreement No. 24 of 02/12/2016 category 37 manuscript of the works of members of the Russian Geographical Society and individual documents in the Simbirsk province, case 35..Electronic copy source: PB