The prescription ingredient survey, consisting of th Ebert survey of 1885, the Hallberg survey of 1895, the Hallberg-Snow survey of 1807, the Charters survey of 1926, the Cook survey of 1930, the Gathercoal survey of 1930, the U.S.P.N.F. survey of 1931-32 - Gathercoal, Edmund Norris (American pharmaceutical association, 1933)