It is unlikely that this work is public domain in the EU, or in any country where the copyright term is life-plus-70 years. However, it is in the public domain in Canada (where IMSLP is hosted) and other countries where the term is life-plus-50 years (like China, Japan, Korea and many others worldwide). As this work was first published before 1923 or failed to meet notice or renewal requirements to secure statutory copyright, it is very likely to be public domain in the USA as well.
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||Poem for String Quartet
Apparently, first copyrighted in the USA in February _1923_, according to the catalog of copyright entries- not sure if that post-1922 date is a problem- Schissel