Entrance to the Baumannshöhle in the Harz Mountains

Graphite on off-white wove paper

Graphite on paper

Brown ink, brown wash and black chalk on cream antique laid paper

Black wash and white gouache over graphite on brown paper

Watercolor over graphite on off-white wove paper

Gouache on heavy off-white wove paper

Colored marker on paper

Black crayon on paper

Graphite on paper

Watercolor and black ink over traces of graphite on off-white antique laid paper, adhered to cream antique laid paper

Black and red conté crayon on ivory tracing paper

Black chalk on blue-gray wove paper