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

Watercolor and graphite on heavy white wove paper

Graphite and collage elements on paper

Crayon on discolored cream wove paper

Black ink and oil on white wove paper, mounted on board

Black and white conté crayon on gray modern laid paper

Ink and graphite on paper

Graphite on paper

Charcoal on buff wove paper

Graphite on paper

Graphite on paper

Black ink on white illustration board

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