Fall of the Tritt in the Mühlethal Valley, Switzerland

Black and brown ink on cream wove paper

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

Black ink and gray wash

Brown and black ink, brown wash over black chalk on off-white wove paper, laid down

Gray ink, gray wash, and graphite on off-white laid paper

Watercolor and graphite on off-white laid paper

Black ink and white gouache

Watercolor over graphite on white laid paper

Brown wash and graphite on cream paper

Black chalk on blue antique laid paper, laid down

Black ink and gray wash