Office and Factory Buildings, Cali, Colombia, 1945: Office unit: construction and millwork details (1/4", 1", 1 1/2" and 6" = 1'-0")

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

Black ink on cream wove paper

Red, black, brown and white conté crayon on ivory tracing paper

Watercolor and graphite on cream wove paper

Transparent and opaque watercolor and graphite on white wove paper

Watercolor and graphite on cream wove paper

Black ink on off-white wove paper

Black ink with gray wash on illustration board

Watercolor and white gouache over graphite on off-white wove paper

Black tempera on cream machine-made wove paper, mounted to off-white laid paper

Ink on slide film, hand colored

Charcoal and chalk on off-white wove paper