Ballast of gravel and cinders (Material Keyword)

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tDAR (the Digital Archaeological Record) is the digital repository of the Center for Digital Antiquity, a collaborative organization and university Center at Arizona State University. Digital Antiquity extends our knowledge of the human past and improves the management of our cultural heritage by permanently preserving digital archaeological data and supporting their discovery, access, and reuse. Digital Antiquity and tDAR are and have been supported by a number of organizations, including the Andrew W. Mellon Foundation, the National Science Foundation, and the National Endowment for the Humanities. A more complete set of acknowledgements are provided here.