2 1 50 John L. Dillon Primary Author Jock R. Anderson Additional Author mixed material 0080374948 Oxford : Pergamon Press, 1990 Oxford : Pergamon Press, 1990 1990 John L. Dillon Additional Author Jock R. Anderson Primary Author J. Brian Hardaker Additional Author mixed material 0813804004 Ames Ames ; The iowa state university press, 1977 1977