File:Ukrainian and Ruthenian language frequency in Poland, based on Polish census of 1931.PNG - Wikimedia Commons
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56% of participating ITC/BSS companies in Poland use German during services delivery | Outsourcing Journal
How many ethnic Germans were living in the parts of Poland belonging to Germany before 1945? Has this proportion been similar throughout the centuries of the German possession thereof? - Quora
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Minority language media and the COVID-19 pandemic – the case of German in Poland: An Interview with Rudolf Urban. - European Centre for Minority Issues (ECMI)
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