Robert S. Duncanson, Landscape with Cows Watering in a Stream, 1871, Oil on canvas, 21 1/8 x 34 1/2 in. (53.7 x 87.6 cm) Robert S. Duncanson, Landscape with Cows Watering in a Stream, 1871, Oil on canvas, 21 1/8 x 34 1/2 in. (53.7 x 87.6 cm)