Study for Soldier with Left Arm Extended and Soldier with Rifle, for "Coming of the Americans," Widener Library, Harvard University

Graphite and ink on paper

Ink on paper; Rajput Style, Kota School

Brown ink and brown wash, with later addition of pale red-colored wash, on cream antique laid paper

Graphite and colored pencil on blueline print

Graphite on off-white wove paper

Black ink, watercolor, and metallic paint over graphite on buff wove paper

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

Black ink on translucent vellum paper

Colored crayons on paper

Black crayon on paper

Black, red and white chalks on blue paper

Gray ink over graphite on off-white paper