For the first time, Popper's Op. 11 set of 3 pieces (Widmung, Humoreske, and Mazurka No. 1) is available in an Urtext edition, based on the first edition by Senff, Plates 1256-59. The main issue with the first edition is that it misses many accidentals, especially in the piano part, and dynamics in the cello part. Some places in the cello part are missing dynamics where the piano has very detailed dynamics notated. We have added bracketed dynamics in these places.