| http://www.w3.org/ns/prov#value | - Letters, 1956-1968, are from colleagues, including one or two each from Giorgio Cavallon, Clement Greenberg, Barnett Newman, Richard Pousette-Dart, Oscar Williams (a picture postcard of himself with Dylan Thomas, 1958) and letters, 1961-1962, concerning the retrospective for Arshile Gorky at the Venice Biennale.
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