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