'America: the third Century.' four posters from the portfolio commissioned by the Mobil Oil Corporation, 1976. Roy Lichtenstein 1923-1987) 'Bicentennial Poster;' Christo (b.1935) 'Texas Mastaba;' Ben Schonzeit (b.1935) 'Yankee Flame;' and Robert Rauschenberg 1925-2008) 'Deposit.' 89 x 61 cm, (sheet)