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Author notes

1All the authors are with the U. S. Public Health Service. Dr. Light, now at the National Institutes of Health, was assistant to the Chief of the Office of Resource Development (Environmental Health) while the survey was under way. Mrs. Pennell is Health Manpower Branch Chief in the Division of Public Health Methods. Mr. Taylor is Milk Sanitation Section Chief in the Milk and Food Branch of the Division of Environmental Engineering and Food Protection and is designated as public Health Service Liaison Officer with the sanitarian profession.

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