Friis, Robert H. Epidemiology for public health practice / Robert H. Friis, Thomas A. Sellers. - Gaithersburg, Md. : Aspen Publishers, c1996. - xiv, 430 p. : ill. ; 23 cm. Includes an Index ISBN: 0834206080 LCCN: Subjects--Topical Terms: Epidemiology.Epidemiology.Public Health. Dewey Class. No.: WA 105 / F916 1996