Office and Factory Buildings, Cali, Colombia, 1945: Elevation (1/16" = 1'-0")

Graphite on off-white wove paper

Black chalk and black crayon on pink laid paper

Off-white wove paper

Graphite and black crayon on off-white wove paper

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

Colored and black crayon on buff wove paper

Casein, pencil, and crayon on casein ground on off-white wove paper

Black ink and blue gouache on off-white illustration board with applied elements

Gray wash over graphite on heavy off-white wove paper

Watercolor on off-white wove paper

Graphite and colored pencil on cream wove paper

Black ink on cream wove paper