Yu. Trusman.Finnish elements in the Gdovsky district, the St. Petersburg province.

Yu. Trusman.Finnish elements in the Gdovsky district, the St. Petersburg province.- 1884. -Agreement No. 24 of 02/12/2016 category 35 manuscript of the works of members of the Russian Geographical Society and separate documents in the Petrograd province, case 43..Electronic copy source: PB