Source: Mark Twain–Howells Letters. Edited by Henry Nash Smith and William M. Gibson, with the assistance of Frederick Anderson. 2 vols. Cambridge: Belknap Press of Harvard University Press. | Vassar College, Poughkeepsie, N.Y.([<i>MTHL</i> | NPV])
Cue: "Geo. H. Yewell, the painter, has made a superb etching"
