North American Industry Classification System (NAICS) 1997
- 62 - Health Care and Social Assistance
- 621 - Ambulatory Health Care Services
- 6219 - Other Ambulatory Health Care Services
- 62191 - Ambulance Services
- 621911 - Ambulance (except Air Ambulance) Services
- 621912 - Air Ambulance Services
- 62199 - All Other Ambulatory Health Care Services
- 621990 - All Other Ambulatory Health Care Services
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