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

Black ink on cream wove paper

Watercolor on off-white wove paper

Leather bound sketchbook

Graphite on heavy weight, white card stock (Strathmore Bristol board)

Black ink and gouache on cream wove paper

Watercolor over graphite on thin off-white wove paper

Charcoal and graphite on white wove notebook paper

Watercolor on off-white wove paper

Watercolor and graphite on cream wove paper

Charcoal with extensive stumping on blue modern laid paper

Graphite on darkened off-white wove paper

Graphite on blue-flecked wove paper