Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Air conditioning units: plans, elevation, sections (1/4" and 3/4" = 1'-0")

Sketchbook with beige-fabric-covered cardboard covers

Black crayon on tan wove paper

Transparent and opaque watercolor on off-white wove paper

Charcoal on blue-flecked beige laid paper

Black ink and graphite on tan, wove paper

Red and black chalk on off-white tracing paper

Black ink and graphite on off-white wove paper

Collage on board

Watercolor, graphite, black ink, and colored chalk on layered paper and translucent plastic, mounted to gray-brown cardboard.

Gouache and collage on off-white wove paper

Graphite on off-white wove paper

Graphite on off-white wove tracing paper