Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Detail of rear stair (1/2", 1 1/2, and 6" = 1'-0")

Black crayon on buff wove paper

Graphite over red wash on off-white wove paper

Black & brown chalk, brown wash, black ink & scratchwork on off-white wove ppr

Black ink on off-white wove paper

Black ink on off-white paper

Graphite on paper

Goauche on off-white wove paper

Black ink on off-white wove paper

Graphite on buff wove paper

Watercolor and white gouache on off-white wove paper

Pastel, opaque watercolor, and graphite on paper

Black felt-tip ink on white wove paper