File:Flag of Germany (1867–1918).svg - Wikimedia Commons

List of German flags - Wikiwand

German Reich - Wikidata

File:War Ensign of Germany (1903-1918) (Flaggenbuch).svg

File:German Empire (1918) Flag Map.png - Wikimedia Commons

Category:SVG flag maps of Germany - Wikimedia Commons

What is the history of the German flag's colors? - Quora

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I find the German flag is one of the most ugly flags I've ever

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List of German flags - Wikiwand