http://dewey.info/scheme/a14/ en
783 Music for single voices    The voice
783.4 Middle voice
http://dewey.info/scheme/a14/ vi
783 Nhạc cho đơn ca    Giọng ca
783.4 Giọng trung
http://dewey.info/scheme/a14/ it
783 Musica per voci singole    La voce
783.4 Voce media
http://dewey.info/scheme/edition/e23/ en
783 Music for single voices
783.4 Middle voice
http://dewey.info/scheme/edition/e22/ de
783 Musik für Einzelstimmen    Die Stimme
783.4 Mittelstimme
Dewey Decimal Classification
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