STACKHOUSE, Robert, (American, 1942-): ''Blue Encounterings'', 1992 4 color spitbite/aquatint/etching, 28.5'' x 35.25'', signed lower right and dated '91, USF Graphicstudio blindstamp, numbered lower left 29/50, unframed. Available from USF for $2,500. Est. $400/600**