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Additional sources and materials

1.Gosudarstvennyj katalog geograficheskih nazvanij [The State Directory of Geographical Names]. Rosreestr. Federalnaya sluzhba gosudarstvennoj registracii, kadastra i kartografii [The Federal Service of the State Registration, Inventory and Cartography]. URL: https://rosreestr.ru/site/activity/gosudarstvennyy-katalog-geograficheskikh-nazvaniy/.
2.Karty. Yandex [Yandex Maps]. URL: https://yandex.ru/maps.
3.Nacionalnyj korpus russkogo yazyka [National Corpus of the Russian Language]. URL: http://www.ruscorpora.ru/. 
4.Poisk indeksa [poiskovyj servis]. Pochta Rossii [Post Index Search. The Russian Post]. URL: https://www.pochta.ru/post-index. 
5.Spravochno-informacionnyj internet-portal “Gramota.ru&8j1; [Reference-Information Website “Gramota.ru&8j1;]. URL: http://new.gramota.ru/.
6.Elektronnaya Moskva [Digital Moscow]. URL: http://mosopen.ru/.