Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Refrigeration system: diagram

Watercolor and white gouache on cream laid paper

Black conté crayon on ivory tracing paper

Graphite on off-white wove paper

Watercolor and gouache over graphite on orange wove paper

Opaque and transparent watercolor on paper

Graphite on translucent wove paper

Graphite on translucent vellum paper, blue ballpoint ink on the verso

Watercolor and black ink on off-white wove paper

Black ink on off-white wove paper

Colored crayons on paper

Graphite on off-white wove paper

Black crayon on blue-flecked cream laid paper