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

Oil on unstretched canvas

Pastel on thin off-white wove paper

Graphite on pink wove paper

Watercolor and graphite on off-white wove paper

Black crayon and ink on paper

Charcoal on off-white laid paper

Graphite on heavy buff card

Black crayon on off-white laid paper

Graphite on off-white wove paper

Black, orange and yellow crayon on paper

Graphite on green wove paper, discolored

Cloth bound sketchbook