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(2010). The River Narva (PDF). Estonian Environmental Board. ISBN 978-9949-9057-4-4. Archived from the original (PDF) on 3 December 2013. Retrieved 2...

Eva-Liis (2010). The river Narva. Tartu: Kuru. pp. 146–148. ISBN 978-9949-9057-4-4. Nordqvist, Kerkko; Kriiska, Aivar (1 January 2010). "Results of Archaeological...