found: Coleridge, S.T. Letter to R. Baldwin, 11/11/1819 (Mr. Davies)
found: Griggs, E.L. Collected letters of S.T. Coleridge, 1971: v. 4, p. 976n1 (William Davies)
found: DNB (Davies, William, d. 1820; bookseller)
found: Fortnight's ramble to the lakes, 1810: t.p. (And sold by T. Cadell and W. Davies, Strand)
found: Online Archive of California, UCLA Library, Dept. of Special Collections, Manuscripts Division. Finding aid for the Caddell & Davies records, 1790-1840, Collection number 922: (The firm was named Cadell & Davies after Cadell and his new partner, William Davies, until Davies' death in 1819) {http://www.oac.cdlib.org/data/13030/ws/kt109n99ws/files/kt109n99ws.pdf}
found: Timperley, C. A dictionary of printers and printing, 1839: p. 945-945 (William Davies, partner of Thomas Cadell, Jr., until Davies died in 1820)
found: Royal Academy of Arts Collections website, May 23, 2011: (William Davies; born 1764; died 1820)
found: Oxford dictionary of national biography online, May 23, 2011: (William Davies, d. 1820)