Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Location of underwater pool lighting: diagram and detail (1/4" = 1'0")

Watercolor and graphite on white wove paper

Black ink, graphite, and yellow chalk on off-white wove paper; verso: black ink

Graphite on buff wove paper

Charcoal on joined and folded off-white paper

Charcoal, white pencil, black ink, red watercolor (or ink) on off-white wove paper

Sketchbook with red cloth-covered cardboard covers

Graphite on buff wove paper

Black ink on off-white wove paper (recto and verso)

Graphite on off-white wove paper

Pastel on off-white illustration board

Graphite on paper

Watercolor over graphite on off-white card