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

Graphite on off-white wove paper

Black ink on off-white wove paper

Graphite on tan wove paper

Paper dots numbered in black ink and mounted on blue/white graph wove paper

Black ink and charcoal on cream laid paper

Black ink over graphite on cream laid paper

Black ink on tan wove paper

Graphite on off-white wove paper

Watercolor on off-white wove paper

Graphite on off-white wove paper

Graphite on darkened off-white tracing paper

Two kinds of graphite and colored wax crayons with extensive stumping on off-white wove paper edged with lavender paper on left and right sides