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2000
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Helmets -- Materials -- Research -- United States -- 21st century. / https://id.loc.gov/authorities/subjects/sh85060069 https://id.loc.gov/authorities/subjects/sh2002006405 https://id.loc.gov/authorities/subjects/sh2002006576 https://id.loc.gov/authorities/names/n78095330-781 https://id.loc.gov/authorities/subjects/sh2002012478
2014
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Helmets -- New York (State) -- New York -- Exhibitions. / https://id.loc.gov/authorities/subjects/sh85060069 https://id.loc.gov/authorities/names/n79007751-781 https://id.loc.gov/authorities/subjects/sh99001275 : Pyhrr, Stuart W.
Helmets -- United States -- History -- 21st century. / https://id.loc.gov/authorities/subjects/sh85060069 https://id.loc.gov/authorities/names/n78095330-781 https://id.loc.gov/authorities/subjects/sh2002006168 : Bauman, Robert