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||1888 ca.|
|Genre Categories||;; ; ;|
|Work Title||Cello Sonata|
|Opus/Catalogue NumberOp./Cat. No.||Op.38|
|Year/Date of CompositionY/D of Comp.||1888 ca.|
|Average DurationAvg. Duration||18 minutes|
|Composer Time PeriodComp. Period||Early 20th century|
|Piece Style||Early 20th century|
Worldcat lists no edition earlier than Edizioni Curzi's of 1947, though that is a New Edition Revised by the composer (which doesn't mean it was necessarily published before then. The listing in one catalog has  non-copyright brackets, but not the listings in two other catalogs. Seems important to establish whether the Izzo edition is earlier than 1947.