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

Watercolor and white gouache over graphite on off-white wove paper

Leather bound sketchbook with additional four drawings on scrap paper

Black ink on off-white wove paper

Graphite on off-white wove paper

Sketchbook with beige cloth-covered cardboard covers

Graphite on tracing paper

Graphite on off-white wove paper

Colored crayons on paper

Graphite on off-white wove paper

Black ink on heavy off-white wove paper

Graphite on paper

Graphite on paper