Migoń, P., & Pijet-Migoń, E. (2021). Not simply volcanoes – The Geoheritage of the Cretaceous System in the Land of the Extinct Volcanoes Geopark, West Sudetes (SW Poland). Geotourism/Geoturystyka, 17(1-2(60-61), 3–22. https://doi.org/10.7494/geotour.2020.60-61.3