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

Black ink on cream wove paper

Watercolor on off-white wove paper

Charcoal on paper

Black ink and gray wash on cream laid paper

Black ink and crayon on cream wove paper

Black crayon on thin off-white wove paper

Graphite and watercolor on off-white wove paper

Black and blue crayon on paper

Crayon on paper

Graphite on buff wove paper

Graphite on off-white wove paper

Ink on paper