{"id":"000006779","type":"book","title":"Sixth (VI) International Flint Symposium : abstracts ; Spain, October 1991 (Madrid, Bilbao, Granada) / (Eds.: M.A. Bustillo y A. Ramos-Millan). - o.O. (Madrid) : Inst. Tecnológico GeoMinero de España. - 348 S. : zahlr. Ill","issued":{"raw":"1991"}}