1. D-REAMS Radiocarbon Laboratory, Weizmann Institute of Science, Rehovot, Israel.
2. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
3. Wyss Institute for Biologically Inspired Engineering, Harvard University, Cambridge, MA 02138, USA.
4. Bundesanstalt für Materialforschung und -prüfung, Berlin, Germany.
5. Centre for the Study of Manuscript Cultures, Hamburg University, Hamburg, Germany.