Authors: M I Murphy; E Neter; T A Olson; E Press; J H Steele; A S Yerby; F D Yoder; B F Mattison; D H Byers; R L Huenemann; E J Kilcawley; A L Knutson; A D Langmuir; G E Mitchell; F E Morre; M S Hilbert Journal: Am J Public Health Nations Health Date: 1967-02