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Books about Gelbke:
Georg Gelbke by Andreas Albert (2007)
Dagmar Gelbkes Brutzelfibel. Stars, Rezepte, Küchentratsch für Fortgeschrittene. by Dagmar Gelbke (Sep 1, 2001)
Wild Bill Gelbke - The Myth and Mystery of this Colorful, Larger than Life Man and His Motorcycles - 1978 Printing... by Buzz Walneck (1000)