Amazon.com: Cnut (Penguin Monarchs): The North Sea King eBook : Lavelle, Ryan: Kindle Store
Holocene relative sea-level data for the East Frisian barrier coast, NW Germany, southern North Sea | Netherlands Journal of Geosciences | Cambridge Core
Amazon.com: Cnut (Penguin Monarchs): The North Sea King eBook : Lavelle, Ryan: Kindle Store