Geological Sketches, Bird's Skull

Graphite on white paper

Black chalk on cream wove paper

Watercolor on paper

Graphite, transparent and opaque watercolor on gray wove paper

Gray ink and gray wash

Graphite on off-white wove paper

Brown ink, graphite, watercolor, and white gouache on cream antique laid paper

Black chalk on cream modern laid paper

Purple chalk on cream modern laid paper

Red chalk, squared, on rice paper

Watercolor, black ink and graphite on cream laid paper

Graphite on off-white paper