Fall of the Tritt in the Mühlethal Valley, Switzerland

Graphite

Black ink and gray wash

Watercolor on off-white paper

Graphite on white paper, border line in black ink

Brown ink, transparent and opaque watercolor, and black, white and red chalks on brown wove paper

Brown wash over black chalk on cream antique laid paper; verso: black chalk

Black ink and gray wash

Black ink, gray wash, and garphite on off-white paper

Black ink and white gouache

Brown ink, gray and brown wash, and graphite on cream paper, borderline in black ink

Brown wash and graphite on cream paper

Red chalk on cream paper, framing line in graphite