Untitled [Woman Seated on Stool]; verso: Untitled [Nude, Two Studies]

Black ink and graphite on off-white wove paper

Blue pen, paper insert, and adhesive on paper

Black crayon on paper

Sketchbook with brown paper-covered cardboard covers

Graphite on paper

Mixed media on paper

Black chalk with touches of graphite on white antique laid paper, with a framing line in black chalk

Graphite on off-white wove paper

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

Graphite, fixed, on off-white wove paper

Oil paint on offset lithograph, 1989 edition of Flora de la Real Expedición Botánica del Nuevo Reino de Granada (1783-1810)

Black crayon on paper