River Landscape; Henry Richard Greville third Earl of Warwick; 1779-1853; British; undated; Brown and gray wash over graphite; verso: brown and gray wash over graphite on medium; moderately textured; cream laid paper; Sheet: 12 3/4 x 10 1/8in. (32.4 x 25.7cm) and Sheet: 12 3/4 x 10 1/8 inches (32.4 x 25.7 cm); landscape; river; rocks (landforms); trees