Onslow, George. (1784–1853) Duo à Quatre Mains Pour le Piano-Forte. [Sonata no. 1 in E minor, for piano, 4 hands, Op. 7] Manuscript (Fragment)Unbound upright folio. In unknown hand. One bifolium of music paper by Lard Esnault, Paris, with 16 staves per page. The extant bifolium was the outer bifolium of the first of probably two signatures, otherwise lost. Fol. 1r: title, with dedication to Camille Pleyel; composer's first name misspelled "Georges"; fol. 1v: Secondo part, beginning; fol. 2r: Primo part, section of the second movement; fol. 2v: Secondo part, end of second movement and