Untitled (front endpaper, left page); Untitled (signature, right page)

Graphite and ink on paper

Graphite and colored pencil on paper

Graphite and white gouache on off-white wove paper

Black and white chalk on light tan antique laid paper

Brown ink and brown wash over black chalk on cream antique laid paper; verso: red chalk

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

Ink and gouache on paper

Black ink and gray wash

Verso: watercolor and black ink over traces of graphite on cream antique laid paper

Brown ink and brown wash over graphite on cream wove paper

Brown ink on off-white antique laid paper; verso: brown ink, brown wash, and red chalk