Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Connector enclosures, second and third floors: details (1/2" = 1'0")

Charcoal on off-white laid paper

Graphite on off-white wove paper

Charcoal and graphite on off-white wove paper; verso: charcoal

Black and red conté crayon on ivory tracing paper

Watercolor over graphite on heavy cream wove paper (recto and verso)

Black ink on beige wove paper

Watercolor over graphite on off-white wove paper

Watercolor over graphite on off-white wove paper

Incised line and Aquarelle on white wove paper

Graphite and watercolor on gray-blue laid paper

Graphite on off-white wove paper