BARKER, D.J.P. Hall, A.J. Practical epidemiology /[by] D.J.P.Barker, A.J.Hall - 3rd ed. - Edinburgh ELBS/Churchill Livingstone 1991 - 173 p. Includes index. ISBN: 443044274 Subjects--Topical Terms: Epidemiology Dewey Class. No.: 614.4 / BAR