Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Typical tread in main stair: details (1 1/2" = 1'-0")

Watercolor and gouache on cream wove paper

Crayon on paper

Charcoal on blue laid paper

Black chalk on off-white wove paper

Watercolor and graphite on off-white wove paper

Graphite on off-white wove paper

Black crayon on paper

Pastel on brown wove paper

Charcoal on beige laid paper

Black ink on cream wove paper

Black crayon on cream wove paper; verso: red and black crayon