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

Watercolor and white gouache over graphite on buff wove paper

Watercolor on ruled off-white wove paper

Black ink and gouache on cream wove paper

Graphite on off-white wove paper, squared in red pencil

Dark brown ink on white wove paper

Graphite on off-white wove paper

Black ink on cream wove paper

Black chalk and black crayon on pink laid paper

Graphite and white chalk on gray wove paper

Graphite on paper

Gouache and watercolor on off-white wove paper

Mixed media on paper