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The composer did not number his quartets.
Communication from Clyde Shaw, 2013-01-28
Who is this person?
2 scores in the State Library of Queensland; on covers: »Zu beziehen von J. Groppe, 8761 Bürgstadt, am Bischoff 22«
Wech 1975, 1992Communication from the Österreichische Gesellschaft für zeitgenössische Musik, 2011-11-21
Australian Music Centre Werder file, list from 1995
Communication from the composer, 2010-09-29; visit, 2010-12-17
Sekretariat for Ny Kompositionsmusik [2011-12-26]
Sketches exist from the first decade of the 20th century for various string quartet compositions. Poem is the only one that was completed.