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 1926 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.
|Genre Categories||; ; ;|
|Work Title||Romantic Suite for Piano|
|Opus/Catalogue NumberOp./Cat. No.||Op.18a|
|I-Catalogue NumberI-Cat. No.||IJH 35|
|Year/Date of CompositionY/D of Comp.||1890s|
|Composer Time PeriodComp. Period||Early 20th century|
If this relates to the Suite moderne Op.18, that was composed in 1897, and this might be a 1918 revision of that 1897 work.
Joseph Holbrooke: Composer, Critic, and Musical Patriot gives "Op.18a (1890s)" for the Romantic suite, actually (p.263.)
The Romantic Suite Op. 18a and the Grande Suite Moderne, Op. 18b are two entirely distinct compositions. Neither is a revision of the other.