Original: Piano Technique - Double Notes. Thirds. Volume 1. Piano Method sheet music. Piano Solo sheet music. Piano Technique - Double Notes. Thirds.
Translation: Exercies by Liszt, Schu Engeler, heart, Wieck, Joseffy, Brahms, Walter, Czerny, Tausig, Pischna, Plaidy, Berens, and Busoni. Studies.