"6139" . . "786.5 |c Orgel |d Organ" . . "786.518993" . . "784.18993 |c Instrumentale vormen afgeleid van liturgische vormen |d Instrumental forms derived from liturgical forms" . "6139" . "6139 784.18993 |c Instrumentale vormen afgeleid van liturgische vormen |d Instrumental forms derived from liturgical forms 786.5 |c Orgel |d Organ 786.518993" . .