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Books about Gruenke:
Förderung bei Rechenschwäche (Fordern Lernen) von Matthias Grünke (2010) Taschenbuch by Matthias Grünke (1000)
Wiki information Gruenke:
Bernard Otto Gruenke was an American stained glass artist who produced one of the first faceted glass windows in the United States in 1949. He was born in Sheboygan, Wisconsin.
B. Gunar Gruenke is a stained glass artist in Wisconsin.