Since this work was first published after 1922 with the prescribed copyright notice, it is unlikely that this work is public domain in the USA. However, it is in the public domain in Canada (where IMSLP is hosted), the EU, and in those countries where the copyright term is life+70 years or less.
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London: Oxford University Press, 1928
Public Domain - Non-PD US [tag/del]
||String Quartet 3
||Dieren, Bernard van
|Year/Date of Composition
||To Frederic Delius
||Early 20th century
||2 Violins, Viola, Cello
well, sort of first published in 1928. 2 movements were published in 1920 (the 2nd and 3rd); are they PD-US? :) (Google only lists them with "no preview" in any case.) - Schissel