{"id":"001247857","type":"book","title":"Vegetation horizons and \"frustrated terps\": new radiocarbon ages from the area near Groningen","pages":"345-356","container-title":"Berichten van de Rijksdienst voor het Oudheidkundig Bodemonderzoek, 39 (1989","author":[{"family":"Streurman","given":"H. J."}],"issued":{"raw":"1989"}}