"7440" . . . . "785.141894" . "785.14 |c Kwartetten |d Quartets" . "7440 784.1894 |c Improvisatievormen, virtuoze vormen |d Improvisatory forms, virtuoso forms 785.14 |c Kwartetten |d Quartets 785.141894" . "7440" . . "784.1894 |c Improvisatievormen, virtuoze vormen |d Improvisatory forms, virtuoso forms" .