Office and Factory Buildings, Cali, Colombia, 1945: Perspective

Black ink, graphite, and yellow chalk on off-white wove paper

Black ink, charcoal, and colored pencil on cream laid paper

Graphite on off-white wove paper

Graphite on paper

Black chalk on off-white wove paper

Transparent and opaque watercolor on paper

Black wash on tan wove paper

Watercolor and brown ink on cream illustration board

Watercolor over graphite on off-white wove paper

Black ink and white gouache over graphite on off-white wove paper

Pen and black ink over graphite on off-white wove paper

Black crayon on dark green-brown wove paper