20230713155538.422824 https://kirj.ee/proceedings-of-the-estonian-academy-of-sciences-geology/?v=11aedd0e4327 Estonia 1406-0132 http://www.eap.ee/public/va_ge/con_u_geo.htm Proceedings of the Estonian Academy of Sciences. Proceedings of the Estonian Academy of Sciences. http://www.digar.ee/id/nlib-digar:12284 Proceedings of the Estonian Academy of Sciences. Geology (Online) Proceedings of the Estonian Academy of Sciences. Geology (Online)