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 (allikas)

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    Erratic boulders as natural monuments in EstoniaKirs, Juho; Pirrus, Enn-AavoProGEO '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, 19971997 / p. 35
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