Duck and Cover Video

"This is an official Civil Defense film produced in co-operation with the Federal Civil Defense Administration and in consultation with the safety commission of the National Education Association." "This film was produced in co-operation with the public schools of Astoria and New York, New York." Through animation, focuses on the steps to be taken for maximum safety in the street or in school in the event of an enemy attack by atomic or other weapons. (Library of Congress)

Citation (Chicago Style): 

United States. Office of Civil Defense. "Duck and Cover." 1951. Film, video. From Library of Congress, Motion Picture, Broadcasting And Recorded Sound Division.ย (accessed August 9, 2018).

Read the related article: 
Usage Statement: 

Public Domain

Public Domain is a copyright term that is often used when talking about copyright for creative works. Under U.S. copyright raw, individual items that are in the public domain are items that are no longer protected by copyright law. This means that you do not need to request permission to re-use, re-publish or even change a copy of the item. Items enter the public domain under U.S. copyright law for a number of reasons: the original copyright may have expired; the item was created by the U.S. Federal Government or other governmental entity that views the things it creates as in the public domain; the work was never protected by copyright for some other reason related to how it was produced (for example, it was a speech that wasn't written down or recorded); or the work doesn't have enough originality to make it eligible for copyright protection.