[Feuermann, Emanuel. (1902–1942)] Sketch Portrait in PerformanceLively portrait of the great cellist in performance, published as one of a series of similar sketched portraits by E. Vernarra and bearing Feuermann's facsimile signature at the foot. On the verso, a further portrait with facsimile signature of the Catalan actress Margarita Xirgu. Right edge rough with some small creases, apparently this having been removed from a volume of similar illustrations, overall in fine condition. 10 x 13 inches (25. 3 x 32.