Apartment House for Interbau Exhibition, Berlin-Hansaviertel, 1955-1957: Sketch of roof plan

Conté crayon, charcoal, graphite, and collaged paper on white wove paper

Black crayon on paper

Graphite on tracing paper

Graphite on paper

Black ink, watercolor, and graphite on gray-green wove paper, discolored to tan; verso: black ink and white gouache

Watercolor and gouache over graphite on off-white wove paper

Watercolor and black ink on heavy off-white wove paper

Graphite and black chalk on off-white wove paper

Black ink on off-white wove paper

Graphite and ink ; graphite on paper

Charcoal on blue laid paper

Graphite on off-white wove paper