Category:Mines in North Rhine-Westphalia opened in the 1920s

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Federal states of Germany:
Baden-Württemberg · Hesse · Lower Saxony · North Rhine-Westphalia · Saarland
Mines in North Rhine-Westphalia opened in the 20th century: ◀ · 1900s · 1910s · 1920s · 1930s · 1940s · 1950s · 1960s · 1970s · 1980s · 1990s · ▶
 See also category: Mines in North Rhine-Westphalia closed in the 1920s.
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