Frank Residence, Pittsburgh, Pennsylvania, 1939-1940: Radiator recess at curved stair wall: plan, sections, and detail (3/4" and 6" = 1'-0")

Black crayon and ink ; black crayon on paper

Graphite on paper

Charcoal, oil stick, acrylic, and Liquid Paper on white wove paper

Black ink on off-white wove paper

Black crayon on paper

Sketchbook with cardboard covers and spiral wire binding

Black and white conté crayon on gray paper, mounted overall to cardboard

Red and black chalk and black ink over graphite on heavy off-white wove paper

Charcoal, oil stick, acrylic, and Liquid Paper on white wove paper

Graphite and ink on paper

Black ink and graphite on off-white wove paper

Graphite and charcoal on paper