http://dewey.info/scheme/a14/ en
782.1 Dramatic vocal forms    Operas
782.1094 European opera
http://dewey.info/scheme/a14/ vi
782.1 Thể loại ca kịch    Ôpêra
782.1094 Ôpêra Châu Âu
http://dewey.info/scheme/a14/ it
782.1 Forme vocali drammatiche    Opere
782.1094 Opera europea
http://dewey.info/scheme/edition/e23/ en
782.1 Operas and related dramatic vocal forms
782.1094 European opera
http://dewey.info/scheme/edition/e22/ de
782.1 Dramatische Vokalmusik    Opern
782.1094 Europäische Oper
Dewey Decimal Classification
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