BOCK, Rudolf, (American, 20th Century): 4 Piece Southwestern landscape painting lot to include; 1) ''Fall In Yosemite Valley Summer 2004'', Oil/Canvas Board, 9'' x 12 1/2'', monogrammed lower right, titled verso; 2) ''Alpen Glow On Mount Humphrey, September, 1972'', Oil/Canvas Board, 10'' x 14'', titled verso, framed, 11 1/2'' x 15 3/4''; 3) ''A Lone Tree'', Oil/Canvas Board, 10'' x 8'', titled lower left, monogrammed RB lower right, framed, 11 1/2'' x 9 1/2''; 4) ''North Rim, Grand Canyon'', Oil/Canvas Board, 12'' x 16'', titled and dated 1992 verso, marked R. Bock, unframed.