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

Watercolor and red ink lines on white wove paper

Graphite on paper

Graphite on off-white laid paper

Watercolor and white gouache over graphite on off-white wove paper

Collage of cut colored paper on wove paper

Gray wash over graphite on blue wove paper

Pen and black ink on folded cream colored paper

Watercolor and gouache on off-white wove paper

Graphite on paper

Graphite on paper

Graphite on off-white wove paper

Graphite on off-white wove paper