Keystone of an Arch, Frontal View and Profile; verso: Sketches of a Ground Plan and a Nude Male Figure

Graphite on off-white laid paper

Ink and graphite on paper

Brown ink and brown wash over black chalk on buff antique laid paper

Black crayon on paper

Black chalk on cream antique laid paper

Graphite on off-white wove paper

Black pen on paper

Watercolor

Graphite, white chalk, and red crayon on green wove paper

Graphite on paper

Charcoal and graphite on off-white laid paper

Graphite