[Roof Study], untitled
Ink and blue pencil sketches on tracing paper, 15-1/2x18 inches
Drawer 3, Folder 5
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Embassy Window [Studies] (#49)
Blue ink sketches on notebook paper, 8-1/2x11 inches
Drawer 3, Folder 5
[Concept Explanation Sketch], untitled
Ink sketches on four sheets of spiral notebook paper, 8-1/2x11 inches
Drawer 3, Folder 5
[Drawings], untitled
Ink drawings on two sheets of tracing paper, 12x15-1/2 inches
Drawer 3, Folder 5
[Plan], untitled
Ink sketch on tracing paper with Birkerts' initials and notations to his staff, 12x16-3/4 inches
Drawer 3, Folder 5
[Site Plan], untitled
Green and brown ink sketch on tracing paper, 17-3/4x30 inches
Drawer 3, Folder 5