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

Ink on paper

Black ink and graphite on graph paper

Graphite on off-white wove paper

Graphite wash, watercolor & blk crayon on off-white wove ppr; verso: blk crayon

Watercolor over graphite on off-white wove paper

Watercolor over graphite on off-white illustration board

Black ink on orange wove paper with postage stamp

Charcoal on heavy buff wove paper

Watercolor and graphite on white wove paper

Purple and black ink on off-white wove paper (surface losses and adhered paper residues occurred in artist's studio)

Graphite on off-white wove paper

Graphite on translucent cream wove paper