[Roof Study], untitled
Ink and blue pencil sketches on tracing paper, 15-1/2x18 inches
Drawer 3, Folder 5
Ink and blue pencil sketches on tracing paper, 15-1/2x18 inches
Blue ink sketches on notebook paper, 8-1/2x11 inches
Ink sketches on four sheets of spiral notebook paper, 8-1/2x11 inches
Ink drawings on two sheets of tracing paper, 12x15-1/2 inches
Ink sketch on tracing paper with Birkerts' initials and notations to his staff, 12x16-3/4 inches
Green and brown ink sketch on tracing paper, 17-3/4x30 inches