On May 21, 1930, the world's biggest airship, the Graf Zeppelin, floated over the Cape Verde Islands and slowed down over an unusual target: the Porto Praia
1930 Graf Zeppelin stamps - Wikipedia
C13-C15 Graf Zeppelin US Airmail Set, MH 1930 - Match and Medicine
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C13 - 1930 65c Graf Zeppelin green - Mystic Stamp Company
Zeppelins - Atlas Obscura
The Controversial Zeppelin Stamps That Enraged 1930s Collectors
The Controversial Zeppelin Stamps That Enraged 1930s Collectors
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C14 - 1930 $1.30 Graf Zeppelin brown - Mystic Stamp Company
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Zeppelins - Atlas Obscura