Baltic Klint in North Estonia as a symbol of Estonian nature
Suuroja, Kalle
2006
https://www.ester.ee/record=b2128676*est
Ida-Virumaa : Sonda. Maidla. Tudulinna. Avinurme. Lohusuu
2005
https://www.ester.ee/record=b2113920*est
Ida-Virumaa : Vaivara, Sillamäe, Toila
2003
https://www.ester.ee/record=b1797409*est