This primary source comes from the Records of the Bureau of Public Roads.
National Archives Identifier:
513342Full Citation: Aerial view of a traffic jam, 14th Street and the Mall, Washington, D.C.; 4/1937; Records of the Bureau of Public Roads, Record Group 30. [Online Version, https://docsteach.org/documents/document/aerial-view-of-a-traffic-jam-14th-street-and-the-mall-washington-dc, March 27, 2025]