Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Water heating system: plan and elevation

Black crayon on paper

Black ink and gray wash on off-white wove paper

Graphite on off-white wove paper

Charcoal on brown wove paper

Charcoal on cream laid paper, fixed

Crayon on paper

Graphite on off-white wove paper

Black ink on white wove paper

Charcoal on off-white modern laid paper, cut down

Red and white chalk on blue-gray laid paper

Crayon on paper

Black ink and graphite on cream board