Svenskt klavikordbygge 1720-1820 : studier i hantverkets teori och praktik jämte instrumentens utveckling och funktion i Sverige under klassisk tid = [Swedish clavichord making 1720-1820] : [studies around the theory and practice of the handicraft in addition to the development and social functions of the instruments in Sweden during classical times] [91-22-00822-5] Helenius Öberg, Eva