{"id":"000030815","type":"book","title":"Age determination by radiocarbon content : world-wide assay of natural radiocarbon. - Washington, D.C","container-title":"Science ; 109.1949, no. 2827, S. 227-228 : 2 Tab","author":[{"family":"Libby","given":"Willard F."}],"issued":{"raw":"1949"}}