1. Air Quality Criteria for Carbon Monoxide, National Air Pollution Control Administration, Report No. AP-62. Durham, North Carolina, March 1970.
2. Air Quality Criteria for Hydrocarbons, National Air Pollution Control Administration, Report No. AP-64. Durham, North Carolina, March 1970.
3. Air Quality Criteria for Particulate Matter, National Air Pollution Control Administration, Report No. AP-49. Durham, North Carolina, January 1969.
4. Air Quality Criteria for Photochemical Oxidants, National Air Pollution Control Administration, Report No. AP-63. Durham, North Carolina, March 1970.
5. Air Quality Criteria for Sulfur Oxides, National Air Pollution Control Administration, Report No. AP-50. Durham, North Carolina, January 1969.