Office and Factory Buildings, Cali, Colombia, 1945: Revisions: elevation, section (1/8" and 1/2" =1'-0")

Watercolor and graphite on off-white wove paper

Opaque watercolor on cream card stock

Graphite on off-white wove paper

Black crayon and ink on paper

Red, white, black and brown conté crayon on gray wove paper

Transparent and opaque watercolor over graphite on cream wove paper

Watercolor, oil, white gouache and graphite on off-white wove paper

Sketchbook with beige cloth-covered cardboard covers

Graphite on paper

Black ink, blue ball-point, graphite, and red pencil on off-white wove paper

Charcoal on off-white wove paper

Graphite on off-white wove paper