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

Watercolor and graphite on white wove paper

Graphite on paper

Black ink on off-white wove paper

Graphite on heavy off-white wove paper

Watercolor over graphite on off-white wove paper

Black crayon on paper

Charcoal on blue wove paper

Watercolor over graphite on off-white wove paper

Acrylic paint on paper mounted on masonite

Graphite and colored wax crayons with extensive stumping, erasure and working with a sharp tool, on off-white wove paper

Black ink on white wove paper

Colored pencil, graphite, and black ink on cream wove paper; verso: watercolor and graphite