K.M.Petrov.Fun of small children (nursery rhymes recorded in Petrozavodsk, Olonets province).

K.M.Petrov.Fun of small children (nursery rhymes recorded in Petrozavodsk, Olonets province).- -.-Agreement No. 24 of 02/12/2016 category 25 manuscript of the works of members of the Russian Geographical Society and separate documents in the Olonets province, case 52..Electronic copy source: PB