Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Long section through skylight over pool (1/2" and 3" = 1'-0")

Crayon on paper

Graphite on paper

Graphite on paper

Black ink and gray wash over black and blue crayon on buff paper mounted on card

Watercolor on cream wove paper

Charcoal on off-white wove paper

Transparent and opaque watercolor and graphite on off-white wove paper

Graphite on off-white laid paper

Graphite on off-white wove paper

Charcoal on white wove paper

Graphite on moderately textured white wove paper

Graphite and ink on paper