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Johnson 2003 is the only known source of information for the compositions, about which information remains to be verified or found.
The quartets are not numbered.
Quartet No. 4 is for violin, viola, cello, and string bass.
Further residences TBA
Latvian Music Information Centre [2011-03-07]
University of Washington Libraries, Guide to the John Verrall Papers [2016-04-07]