An international predecessor of the UNESCO Convention and NAGPRA is the 1954 Hague Convention for the Protection of Cultural Property in the Event of Armed Conflict.
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Thomas is a major supporter of Native American Graves Protection and Repatriation Act (NAGPRA) and is sympathetic to Native American rights.
He has worked with the Kenaitze Indian Tribe to help with its response to the Native American Graves Protection and Repatriation Act and is working with the tribe to develop a program to teach the Dena'ina language.