Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Duct and revised coal pocket: section and details (1/2" = 1'-0")

Oil and gouache on off-white wove paper

Graphite on paper

Watercolor on cream wove paper

Watercolor on white Asian paper

Graphite on paper

Graphite on cream wove paper; verso: black ink and graphite

Charcoal on off-white laid paper

Black ink on cream wove paper

Graphite on paper

Black ink on cream wove paper; verso: brown crayon and graphite

Watercolor over graphite on off-white wove paper

Graphite on off-white wove paper