Office and Factory Buildings, Cali, Colombia, 1945: Plan and concrete column detail (1/50" and 1" = 1'-0")

Watercolor on buff card, mounted on card covered with fabric border

Black ink on cream wove paper

Black chalk on off-white laid paper

Watercolor and graphite on white wove paper

Charcoal on cream laid paper

Graphite on off-white wove paper

Charcoal on off-white laid paper

Black ink on off-white wove paper

Black ink and graphite on graph paper

Black ink on tan wove paper

Black crayon over graphite on off-white wove paper

Crayon, opaque watercolor and graphite on white thick rough wove paper