found: Wölfl, Joseph. La surprise de Diane, ou, Le triomphe de l'amour, 1806?:title page (Lavenu & Mitchell)
found: Humphries, Charles. Music publishing in the British Isles, 1954(Lavenu & Mitchell; London music sellers, printers, publishers; located at 29 New Bond Street (at their Music Circulating Library) ca. 1802-1805; 26 New Bond Street ca. 1805-1808, partnership dissolved ca. 1808)
found: The London Gazette, November 25, 1806:page 1547 (November 7, 1806: The copartnetship between Lewis Lavence [that is, Lavenu] and Charles Mitchell, of New-Bond-Street [London], music-sellers, is dissolved by mutual consent. All debts to be paid and received by Lewis Lavence [that is, Lavenu])
