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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||Ballade for Horn and Piano
Published without (c) notice, so PD-US.
Plate no. 2099 (Bärenreiter-Ausgabe) if sequential, places its date between 1941 (composition) and 1944 (B-A 2120, Walter Kraft's Christus.)