Report on Market-Milk Supplies of Certain Urban Communities: Compliance of the Market-Milk Supplies of Certain Urban Communities with the Grade A Pasteurized and Grade A Raw Milk Requirements of the Public Health Service Milk Ordinance and Code (As Shown by Compliance (Not Safety) Ratings of 90 Percent or More Reported by the State Milk-Sanitation Authorities during the Period July 1, 1936, to June 30, 1938)