Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: General layout of mechanical and boiler equipment: plan and sections (1/4" = 1'-0" )

Sketchbook with beige cloth covers and pencil sleeves

Watercolor and graphite on off-white wove paper

Black ink on off-white wove paper

Watercolor and gouache over graphite on orange wove paper

Graphite on off-white wove paper

Black ink over charcoal on off-white wove paper

Oil on paper

Graphite on paper

Graphite on paper

Crayon on paper

Graphite and white gouache on gray-green wove paper

Watercolor and black ink on illustration board