Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Plumbing diagrams (1/8" = 1'-0")

Black ink on off-white wove paper

Charcoal on blue laid paper

Black ink on off-white wove paper

Graphite on paper

Watercolor over graphite on off-white illustration board

Graphite and white gouache on heavy cream wove paper

Collage of newsprint with opaque watercolor; graphite and scored on off white wove paper

Graphite and ink on paper

Sketchbook with brown cloth-covered cardboard covers

Sketchbook with gray cardboard covers, held together by white spiral wire

Graphite on cream wove paper

Black ink and gray wash on cream laid paper