Urban Air Defense Distribution Chart. Illustrated print with black ink on white paper contains a schematic with air defense mechanisms. At bottom, symbols denote distance from city center to it's perimeter. Black characters at top and bottom within the white margin. Engraving or Letterpress. Created by Smithsonian National Air and Space Museum Date Created 02/28/2022 Source Smithsonian National Air and Space Museum Keywords Art; Aviation; Military Rights and Restrictions Not determined
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