Source
Government of Russia, Federal Agency of Sea and River Transport, available at http://morflot.gov.ru/deyatelnost/napravleniya_deyatelnosti/portyi_rf/perechen_rechnyih_portov.html
Government of Russia, Federal Agency of Sea and River Transport, available at http://morflot.gov.ru/deyatelnost/napravleniya_deyatelnosti/portyi_rf/perechen_rechnyih_portov.html