Historic lime-mortar 14C dating of Santa María la real (Zarautz, northern Spain): Extraction of suitable grain size for reliable 14C dating

1. Ortega, L.A.
2. Zuluaga, M.C.
3. Alonso-Olazabal, A.
4. Murelaga, X.
5. Insausti, M.
6. Ibañez-Etxeberria, A.