Chl.-Sotr., HolyVasily Gromov.The opening and freezing time of the Volga River in Kozmodemyansk from 1856 to 1864.

Chl.-Sotr., HolyVasily Gromov.The opening and freezing time of the Volga River in Kozmodemyansk from 1856 to 1864.- 1864. -Agreement No. 24 of 02/12/2016 category 14 of the manuscript of the works of members of the Russian Geographical Society and separate documents on the Yekaterinoslav province, case 20..Electronic copy source: PB