Global geoheritage - international significance and biodiversity values : proceedings of the workshop of the IUCN-WCPA geoheritage specialist group and the Federal Agency for Nature Conversation (BfN) at the International Academy for Nature Conversation on the Isle of Vilm, Germany, 4-7 April 2018 / edited by Bärbel Vogel, Kyung Sik Woo, Ralf Grunewald, Roger Crofts, Gisela Stolpe ; BfN, Federal Agency for Nature Conservation
