Landscape with River, House, and Mountains

Colored marker on paper

Graphite and colored crayon on paper

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

Transparent and opaque watercolor over graphite on white wove paper on two sheets, joined; verso: graphite

Red chalk on off-white antique laid paper

Watercolor and graphite on off-white wove paper

Black and brown ink, brown and gray wash, over black chalk on off white antique laid paper, laid down on off-white antique laid paper

Charcoal on cream laid 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

Colored marker, paper, and adhesive on paper

Graphite on paper