Untitled (bleed-through of previous page, left page); Untitled ("Tobago face," right page)

Blue pen on paper, adhesive, black pen, and colored marker on paper

Graphite on white modern laid paper

Graphite on paper

Colored marker on paper

Colored marker and black pen on paper

Red, brown, black and white conté crayon on gray wove paper

Black ink on off-white wove paper

Graphite on paper

Graphite with blue and blue-green crayon on paper

Brown ink and brown wash, heightened with white gouache, on antique laid paper prepared with yellow wash

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

Transparent and opaque watercolor on buff wove paper