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

Black crayon and ink on paper

Watercolor over graphite on off-white wove paper

Graphite on off-white wove paper; verso covered in red chalk for transfer

Black ink and touches of graphite on white wove paper, mounted to cardboard

Graphite on off-white wove paper

Watercolor over graphite on off-white wove paper

Black ink on tan wove paper

Graphite with touches of red crayon on off-white wove paper

Charcoal on cream laid paper

Graphite on paper

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

Watercolor, black ink and metallic paint over graphite on buff wove paper