CLEMENS, SAMUEL ("Mark Twain"). 3 glass photographic negatives depicting Clemens in various poses. Each 215 x 165mm. (8 ½ x 6 ½in.) on glass plates, fine; each plate contains typed label which reads: "This negative is property of H. Walter Barnett, Parkside Knightsbridge." Attractive group of photographic negatives showing Twain in cap and gown in various seated poses (one with his daughter [Suzy?] standing beside him. (3)