Study for Belgium's Feet, verso: Study for Britain, for "Coming of the Americans," Widener Library, Harvard University

Graphite on paper

Colored marker on paper

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

Watercolor over graphite on off-white wove paper

Graphite on heavy cream wove paper

Black ink with traces of charcoal on Asian paper

Graphite on paper

Brown ink and brown wash over black chalk on white paper, laid down

Graphite on off-white wove paper

Graphite on paper

Black crayon on paper and mounted

Graphite on off-white wove paper