found: Lassie come home [MP] 1943:credits (screenplay by Hugo Butler)
found: Int'l film necrology, 1982:p. 44 (Hugo Butler; b. May 4, 1914 in Calgary, Alberta, Canada; d. 1/7/68)
found: La joven, c2000:t.p. (Hugo Butler) p. 3 (wrote some screenplays under the pseud. H.B. Addis)
found: Robinson Crusoe [VR], 2002?:credits (screenplay, Philip Ansel Roll)
found: Internet movie database, Oct. 20, 2004(Hugo Butler; b. May 4, 1914, Calgary, Alberta, Canada; d. Jan. 7, 1968, Hollywood, Calif.; sometimes credited as H.B. Addis, Hugo Mozo, Philip Ansel Roll, Philip Ansell Roll)
