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

Crayon on buff tracing paper, with graphite inscriptions

Oil and black ink on wove paper

Black crayon and ink on paper

Graphite on off-white wove paper

Graphite on paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Black ink on off-white wove paper

Ink on paper

Incised line and Aquarelle on white wove paper

Black ink on off-white wove paper

Black ink and graphite on tan wove paper; verso: black ink