A Report of a study of official health administration in North DakotaPlatt W. Covington, North Dakota. State Planning Board. Public Health Committee, North Dakota. State Public Health Advisory Council · First published 1938Open the Tome
Health departments of states and provinces of the United States and CanadaJohn A. Ferrell, Wilson G. Smillie, Platt W. Covington, Pauline A. Mead · First published 1932Open the Tome
