Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Interior elevations of swimming pool (1/4" and 1/2" = 1'-0")

Black ink on off-white wove paper

Graphite on paper

Colored crayons on paper

Charcoal on paper

Graphite on paper

Crayon on paper

Black ink on cream wove paper

Black ink and watercolor over graphite on cream wove paper; album leaf: watercolor and graphite on cream wove paper

Black ink and graphite on off-white wove paper

Watercolor, white gouache and gold paint over graphite on heavy cream wove paper

Graphite on off-white wove paper

Watercolor and graphite on cream wove paper