Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country. Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Rail_Zeppelin_postcard.jpg
This image was originally posted to Flickr by San Diego Air & Space Museum Archives at https://flickr.com/photos/49487266@N07/27059548949. It was reviewed on 2020-03-27 13:23:12 by FlickreviewR 2, who found it to be licensed under the terms of the No known copyright restrictions, which is compatible with the Commons. It is, however, not the same license as given above, and it is unknown whether that license ever was valid.
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