Robert Smithson's "Spiral Jetty" Added to National Register of Historic Places / Robert Smithson's 'Spiral Jetty' Added to National Register of Historic Places / 'Teresita Fernandez / Robert Smithson' Review: Traversing Terrain and Generations / Teresita Fernandez Shows Previously Unexhibited Works by Robert Smithson--and Finds Reasons to Argue with Him / Robert Smithson and Marie Laurencin: Divulging the Secrets of Artists