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HoltSmithson Foundation Robert Smithson Spiral Jetty 1970Great Salt Lake UtahCollection of Dia Art Foundation Nancy Holt Sun Tunnels 197376 Great Basin Desert UtahCollection Dia Art Foundation with support from HoltSmithson Foundation Video Charles UibelGreat Salt Lake Photography HoltSmithson Foundation and Dia Art Foundation Licensed by Artists Rights Society New York The Foundation Nancy Holt 19382014 and Robert Smithson 19381973 transformed the world of art and ideas. HoltSmithson Foundationdevelops their distinctive creative legacies. Collaborating with artists writers thinkers and institutions HoltSmithson Foundation realizes exhibitions publishes books initiates artist commissions programs educational events encourages research and develops collections globally from its headquarters in New Mexico. Biographies Nancy Holt 19382014 Nancy Holt April 5 1938 February 8 2014 was a member of the earth land and conceptual art movements.