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

Black ink, graphite, and yellow chalk on off-white wove paper

Graphite on off-white wove paper

Graphite on paper

Watercolor over graphite? on off-white wove paper

Watercolor over graphite on off-white illustration board

Beeswax, graphite, detritus and debris on wove paper

Black ink on cream wove paper

Black crayon on paper

Mixed media on paper

Graphite on off-white wove paper

Graphite on off-white wove paper

Brown ink and brown wash on cream wove paper