Protection of the geosites and the monograph "Estonian ancient natural monuments"

Pirrus, E., Raudsepp, R. Protection of the geosites and the monograph "Estonian ancient natural monuments" // ProGEO '97. Brochure of abstracts : the Second General Assembly of the European Association for the Conservation of the Geological Heritage : scientific conference : Tallinn-Lahemaa National Park, June 2nd-4th, 1997. Tallinn, 1997. p. 9.