Office and Factory Buildings, Cali, Colombia, 1945: Office unit: plan, elevations, section (1/16" and 1/8" = 1'-0")

Transparent and opaque watercolor and black ink on blue wove paper

Graphite powder and incised lines on Japanese paper

Gray wash on off-white wove paper

Graphite on paper

Black ink on off-white wove paper

Graphite on off-white wove paper

Graphite on paper

Metallic paint, black ink and watercolor over graphite on heavy off-white wove paper; verso: graphite

Graphite on paper

Graphite on paper

Black ink on blue-ruled white graph paper

Graphite on paper