Gunnar Widforss, Grand Canyon Map, gouache, 21 x 40 (sight). Private collection, courtesy Gerald Peters Gallery. ← Previous Next → Gunnar Widforss, Grand Canyon Map, gouache, 21 x 40 (sight). Private collection, courtesy Gerald Peters Gallery. Gunnar Widforss, Grand Canyon Map, gouache, 21 x 40 (sight). Private collection, courtesy Gerald Peters Gallery.