Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Refrigeration system: diagram

Graphite on paper

Charcoal on off-white laid paper

Watercolor over graphite on darkened off-white wove paper

Black ink on frosted mylar

Graphite on paper

Sketchbook with beige-fabric-covered cardboard covers

Black ink on cream wove paper

Black ink and orange crayon on dark cream wove paper, darkened

Watercolor and graphite on cream wove paper

Black ink, graphite, and colored chalk on translucent buff wove paper

Graphite on commercially lined paper

Watercolor over graphite on off-white wove paper