Acknowledgements

tDAR is the digital repository of , a collaborative organization dedicated to enhancing preservation and access to the digital records of archaeological investigations. Hosted by , , and the (0433959 and 0624341), and a grant jointly funded by the (PX-50022-09) and the Higher Education Funding Council for England of the United Kingdom acting through the (JISC). Any opinions, findings, conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect those of the National Science Foundation, the Mellon Foundation, the National Endowment for the Humanities or the Joint Information Systems Committee.