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

Graphite on paper

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

pen, ink on brown paper

Watercolor over graphite on cream wove paper

Graphite on paper

Graphite on thin off-white wove paper

Black crayon on paper

Charcoal, white pencil, black ink, red watercolor (or ink) on off-white wove paper

Black ink and white gouache on card prepared with blue-gray tempera

Graphite on paper

Watercolor on off-white wove paper

Black ink on off-white wove paper