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

Watercolor and gouache over graphite on paper

Graphite on dark cream laid paper

Graphite on paper

Black fiber-tip pen, graphite, green and orange colored pencil on tracing paper

Brown ink and brown wash on cream moderately textured wove paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Gray wash, black ink, charcoal (applied wet), and red pencil on thin off-white wove paper; verso: black crayon and red pencil

Watercolor on white paper

Graphite on off-white wove paper

Gray wash over graphite on thin cream wove paper, mounted to heavy cardboard

Graphite on gesso on paper