Lights Out Across the Pacific Coast.
World War II broadside declaring the institution of Public Proclamation No. 10, which heavily controlled the use of artificial lighting on the West Coast, so as to inhibit nighttime attacks by Japanese warships and planes.
The map includes the text of the proclamation on the left-hand side and a map of the affected counties on the right. At the bottom is "Exhibit A - Description of Zone of Restricted Lighting", which lists the counties under the restriction - not all counties were fully restricted, for instance in San Diego the Proclamation only applies to "all that portion situated westerly of Anza Desert State Park."
The decree was promulgated by Lieutenant General J.L. DeWitt, who was in charge of the defense of the West Coast at the time. He probably most famous today for having overseen the internment of Japanese Americans during the Second World War.