Glass plaque: NGK Spark Plug Facility, 2007 April 28, Box: VI - 15. Senator John D. (Jay) Rockefeller IV papers, A&M-4050. West Virginia and Regional History Center.
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Glass plaque: NGK Spark Plug Facility, 2007 April 28, Box: VI - 15. Senator John D. (Jay) Rockefeller IV papers, A&M-4050. West Virginia and Regional History Center. https://archives.lib.wvu.edu/repositories/2/archival_objects/201047 Accessed December 06, 2025.