Köln, Arno-Volk-Verlag 1968 149pp. + 6 plates out-of-text, 22cm., softcover, in the series "Beiträge zur Rheinischen Musikgeschichte", good condition, copy from the collection of the Belgian musicologist prof.dr. René Bernard Lenaerts (with his handwritten signature and ex-dono ex-libris tipped in, M98231