Picture of Passanger Zeppelin LZ 7

• Source: http://loc.gov/pictures/resource/ggbain.09494/, http://hdl.loc.gov/loc.pnp/ggbain.09494
• Author: Library of Congress Prints and Photographs Division Washington, D.C
• Licence: Creative Commons Attribution-Share Alike 2.5 Generic, Public domain in the United States