found: His Martyrilogium Usuardi monachi, 1515:t.p. (... Usuardi monachi)
found: Hoefer(Usuard, French hagiographer; d. 1-13-876 or 877)
found: LC PREMARC file, 10-28-86(hdg.: Usuard, d. ca. 875)
found: NUC pre-1956(Usuard, d. ca. 875)
found: BN(Usuard, moine bénédictin de Saint-Germain-des-Pres)
found: Kapsner, O. Benedictine bibliography(Usuard, monk of St.-Germain-des-Prés, d. ca. 875)
found: Grande encycl.(Usuard or Husward (Usuardus, Husardus); French benedictine of 9th cent.; d. 1-13-876 or 877)