Digitale reprod. van: Berichten van de Rijkdienst
Westergo in the early Middle Ages / J. Bazelmans, D. Gerrets,
voor het Oudheidkundig Bodemonderzoek 45 (2002). - P.
Metal detection and the Frisian Kingdom : questions
Bazelmans, Josephus Godefridus Antonius 1963- Gerrets,
Kingdom : questions about the central place of northern
about the central place of northern Westergo in the early