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

Graphite and black and colored crayons on cream wove paper

Black ink, graphite, and yellow chalk on off-white wove paper

Black ink and colored chalk on translucent buff wove paper

Watercolor on ruled off-white wove paper

Charcoal on off-white laid paper

Black crayon and ink on paper

Watercolor and brown ink on off-white wove paper

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

Graphite on off-white wove paper (recto and verso)

Black ink, graphite, and yellow chalk on off-white wove paper

Graphite and conté crayon on cream wove paper; verso: graphite

Graphite