Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Section through pool wing (1 1/2" = 1'-0")

Leather bound sketchbook with additional four drawings on scrap paper

Graphite on thin off-white wove paper

Graphite on off-white laid paper

Ink and gouache on paper

Graphite on tan wove paper

Gray wash and graphite on cream wove paper

Black crayon on paper

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

Black ink and graphite on off-white wove paper

Graphite and black ink on off-white wove paper

Graphite on off-white wove paper

Black ink on tan wove paper