Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Radiator recess at curved stair wall: plan, sections, and detail (3/4" and 6" = 1'-0")

Black ink on white wove paper

Transparent and opaque watercolor and charcoal on heavy white wove paper

Graphite on paper

Charcoal on paper

Black marker on graph paper

Watercolor on off-white wove paper

Watercolor over graphite on off-white wove paper; verso: graphite

Graphite on paper

Graphite and colored pencil on paper

Black ink and charcoal on cream laid paper

Graphite on off-white wove paper

Graphite on cream wove paper