found: Its Catalogue of secondhand books, 1965: t.p. (Henry Sotheran Ltd.)
found: Its Catalogue of the library of the late Alfred Austin, 1913: t.p. (Henry Sotheran & Co.)
found: LC data base, 3-27-91 (hdg.: Sotheran, firm, booksellers, London; usage: Henry Sotheran & Co., Henry Sotheran Ltd.)
found: American commonwealth, 1888: front endpaper (H. Sotheran & Co.)
found: Its Modern first editions, spring 2007: t.p. (Henry Sotheran Ltd.; Sotheran's of Sackville Street; 2 Sackville St., Piccadilly, London; founded in York 1761; est. in London 1815)