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Brockhaus-1911: Opera supererogationis · Opera
Herder-1854: Opera [2] · Opera [1] · Opera supererogationis
Meyers-1905: Opĕra supererogatiōnis · Opĕra [1] · Opĕra [2] · Opĕra et studio · Ballad-opera · Opéra · Opĕra di basso riliēvo
Pierer-1857: Opĕra [3] · Opĕra [2] · Opĕra [1]
Sulzer-1771: Oper; Opera