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Röntgen did not number his quartets.
The Julius Röntgen website [2012-06-24] says that he settled in the Netherlands in 1878.
Mahler-Rosé Collection, Western University (Ontario, Canada)
Communication from the composer, 2011-04-12
Further residences to be determined
Communication from William Rowson, 2014-10-29
Polish Culture [2015-01-25]