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

Graphite on heavy white wove paper

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

Charcoal on Ingres charcoal paper

Ink on off-white wove paper

Watercolor over graphite on off-white card

Black ink on white wove paper with perforations

Watercolor and graphite on layered cream wove paper

Charcoal on blue laid paper

Crayon on paper

Charcoal on joined and folded off-white paper

Graphite on off-white wove paper

Charcoal and graphite on off-white laid paper