Service industries-Employees-Health and hygiene-United States 4 Service industries-United States-Safety measures Human services-United States-Employees 1 Materials handling-United States-Safety measures 1 Municipal services-United States-Employees 1 Retail trade-Employees-Health and hygiene-United States 1 White collar workers-Health and hygiene-United States 1 Wholesale trade-Employees-Health and hygiene-United States 1