Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Air conditioning units: plans, elevation, sections (1/4" and 3/4" = 1'-0")

Graphite on off-white wove paper

Graphite on off-white wove paper

Black crayon on cream wove paper

Crayon on paper

Charcoal on buff wove paper

Graphite and colored wax crayons with extensive stumping, erasure and working with a sharp tool, on off-white wove paper

Graphite on off-white wove paper

Ink on paper

Watercolor and white gouache over graphite on off-white wove paper

Crayon on paper

Black crayon on off-white wove paper

Black crayon on cream laid paper