Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Long section through skylight over pool (1/2" and 3" = 1'-0")

Graphite on cream wove paper

Graphite on paper

Black colored pencil on tan wove paper

Brown ink and brown wash on cream wove paper

Charcoal on off-white laid paper

Charcoal on beige laid paper

Black ink on off-white card

Charcoal and graphite on cream wove paper

Black ink on off-white wove paper

Graphite on paper

Graphite on translucent vellum paper

Black ink and white crayon on orange wove paper