{"id":"001194081","type":"book","title":"Neolithic flint mining at Valkenburg aan de Geul (Limburg, the Netherlands); a preliminary report","pages":"167-170","container-title":"Notae Praehistoricae, 12 (1993","author":[{"family":"Brounen","given":"Fred T. S."}],"issued":{"raw":"1993"}}