Office and Factory Buildings, Cali, Colombia, 1945: Revisions: elevation, section (1/8" and 1/2" =1'-0")

Black ink and graphite on off-white wove paper (recto and verso)

Black crayon on blue-flecked cream laid paper

Oil and colored ink on off-white wove paper

Watercolor and graphite on off-white wove paper

Incised line and Aquarelle on white wove paper

Black ink and yellow chalk on off-white wove paper

Watercolor and white gouache over graphite on off-white wove paper

Watercolor and graphite on layered off-white wove paper

Knotted thread, tape measures, eyelets

Graphite on paper

Graphite on off-white wove paper

Graphite on paper