Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Portable loudspeaker unit: plan, elevation, sections (3" = 1'-0")

Graphite on off-white wove paper

Black ink on cream wove paper

Watercolor, graphite and collage on cream wove paper (recto and verso)

Sketchbook with cardboard covers and spiral wire binding

Graphite on heavy cream wove paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Black ink on thin cream wove paper

Red crayon on heavy off-white wove paper

Black marker and watercolor on beige wove translucent paper

Graphite on darkened off-white wove paper

Watercolor on off-white wove paper, mounted to off-white cardboard