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- [1] THE HARP IN ITS PRESENT IMPROVED STATE COMPARED WITH THE ORIGINAL PEDAL HARP BY ERARD,PIERRE (1821) - IMPROVED MECHANISM OF PIANO BY ERARD (1834) - REPORT GIVEN APRIL 17, 1815 TO THE 1ST AND 4TH CLASSES AT THE INSTITUTE-DE-FRANCE ON THE DOUBLE ACTION PEDAL HARP OF ERARD,SEBASTIEN (1834) - THE PIANO OF ERARD AT THE EXPOSITION OF 1844 (1844) - ERARD,SEBASTIEN AND ERARD,PIERRE MANUFACTURERS OF PIANOS AND HARPS (1878) - FRENCH - ERARD,DER [J]. REVUE DE MUSICOLOGIE, 1981, 67 (01) : 110 - 110