It is very 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 (such as 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 with no "restoration" under the GATT amendments, it is very likely to be public domain in the USA as well.
|Composition Year||1920, rev. 1939|
|Genre Categories||; ; ;|
|Work Title||Piano Sonata No.3|
|Opus/Catalogue NumberOp./Cat. No.||Op.19|
|Year/Date of CompositionY/D of Comp.||1920, rev. 1939|
|First Performance.||1922, in Moscow by S. Feinberg|
|Copyright Information||This work is claimed to be under copyright in the USA due to|
"restoration" via the GATT/TRIPS amendment (Section 104).
|Composer Time PeriodComp. Period||Early 20th century|
|Piece Style||Early 20th century|
http://www.worldcat.org/title/sonata-pour-piano-no-3-c-moll-op-19/oclc/20832116&referer=brief_results According to worldcat, The first edition was published in 1921.