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

Graphite on cream wove paper

Black ink on cream wove paper; verso: black ink, blue watercolor, and green and orange crayon

Watercolor on off-white wove paper

Graphite and brown ink on off-white card

Watercolor and white gouache over graphite on darkened off-white wove paper

Watercolor and graphite on white wove paper

Black ink and graphite on thin buff wove paper

Ink wash, black chalk, graphite, and white gouache on cream laid paper

Graphite on off-white wove paper

Graphite on paper

Off-white card

Black ink over graphite on off-white wove paper